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Environmental Science Exam 1
UI Intro to Environmental Science Exam 1
256
Environmental Studies
Undergraduate 1
09/12/2012

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Term
Environment
Definition
The sum total of our surroundings, including all of the living things and non-living things with which we interact.
Term
Environmental science
Definition
The study of how the natural world functions and how humans and the environment interact.
Term
Natural Resources
Definition
Any of the various substances and energy sources we need in order to survive.
Term
Renewable natural resources
Definition
A natural resource that is virtually unlimited or that is replenished by the environment over relatively short periods of hours to weeks to years.
Term
Nonrenewable natural resources
Definition
A natural resource that is in limited supply and is formed much more slowly than we use it.
Term
Ecosystem services
Definition
An essential service an ecosystem provides that supports life and makes economic activity possible. For example, ecosystems naturally purify air and water, cycle nutrients, provide for plants to be pollinated by animals, and serve as receptacles and recycling systems for the waste generated by our economic activity.
Term
Agricultural revolution
Definition
The shift around 10,000 years ago from a hunter-gatherer lifestyle to an agricultural way of life in which people began to grow their own crops and raise domestic animals.
Term
Industrial revolution
Definition
The shift in the mid-1700s from rural life, animal-powered agriculture, and manufacturing by craftsmen to an urban society powered by fossil fuels such as coal and crude oil.
Term
Fossil fuels
Definition
A nonrenewable natural resource such as crude oil, natural gas, or coal, produces by the decomposition and compression of organic matter from ancient life.
Term
Tragedy of the commons
Definition
Because no single person owns a common area, no one has incentive to expend effort taking are of it, and everyone takes what he or she can until the resource is depleted.
Term
Ecological footprint
Definition
The cumulative amount of land and water required to provide the raw materials a person or population consumes and to dispose of or recycle the waste that is produced.
Term
Overshoot
Definition
The amount by which humanity has surpassed Earth's long-term carrying capacity for our species.
Term
Environmental studies
Definition
An academic environmental science program that heavily incorporates the social sciences as well as the natural sciences.
Term
Environmentalism
Definition
A social movement dedicated to protecting the natural world.
Term
Scientific method
Definition
A formalized method for testing ideas with observations that involves several assumptions and a more or less consisten series of interrelated steps.
Term
Hypothesis
Definition
A statement that attempts to explain a phenomenon or answer a scientific question.
Term
Predictions
Definition
A specific statement, generally arising from a hypothesis, that can be tested directly and unequivocally.
Term
Experiment
Definition
An activity designed to test the validity of a hypothesis by manipulating variables.
Term
Variables
Definition
In an experiment, a condition that can change.
Term
Independent variable
Definition
The variable that the scientist manipulates in a manipulative experiment.
Term
Dependent variable
Definition
The variable that is affected by manipulation of the independent variable.
Term
Controlled experiment
Definition
An experiment in which the effects of all variables are held constant, except the one whose effect is being tested by comparison of treatment and control conditions.
Term
Control
Definition
The portion of an experiment in which a variable has been left unmanipulated to serve as a point of comparison with the treatment.
Term
Treatment
Definition
The portion of an experiment in which a variable has been manipulated in order to test its effect.
Term
Data
Definition
Information, generally qualitative information
Term
Manipulative experiment
Definition
An experiment in which the researcher actively chooses and manipulates the independent variable.
Term
Natural experiments
Definition
An experiment in which the researcher cannot directly manipulate the variables and therefore must observe nature, comparing conditions in which variables differ, and interpret the results.
Term
Correlation
Definition
A relationship among variables
Term
Peer review
Definition
The process by which a manuscript submitted for publication in an academic journal is examined by other specialists in the field, who provide comments and criticism generally anonymously and judge whether the work merits publication in the journal.
Term
Theory
Definition
A widely accepted, well-tested explanation of one or more cause-and-effect relationships that has been extensively validated by a great amount of research.
Term
Paradigm
Definition
A dominant philosophical and theoretical framework within a scientific discipline.
Term
Sustainability
Definition
A guiding principle of environmental science that requires us to live in such a way as to maintain Earth's systems and its natural resources for the foreseeable future.
Term
Biodiversity
Definition
The variety of life across all levels of biological organization, including the diversity of species, their genes, their populations, and their communities.
Term
Millenium Ecosystem Assessment
Definition
The most comprehensive scientific assessment of the present condition of the world's ecological systems and their ability to continue supporting our civilization. Prepared by over 2,000 of the world's leading environmental scientists from nearly 100 nations, and completed in 2005
Term
Cornucopian
Definition
A worldview that we will find ways to make Earth's natural resoureces meet all of our needs indefinitely and that human ingenuity will see us through any difficulty. In Greek mythology, cornucopia — literally "horn of plenty" — is the name for a magical goat's horn that overflowed with grain, fruit, and flowers.
Term
Cassandras
Definition
A worldview that predicts doom and disaster as a result of our environmental impacts. In Greek mythology, Cassandra was the princess of Troy with the gift of prophecy, whose dire predictions were not believed.
Term
Sustainable development
Definition
Development that satisfies our current needs without compromising the future availability of natural resources or our future quality of life.
Term
Triple bottom line
Definition
An approach to sustainability that attempts to meet environmental, economic, and social goals simultaneously.
Term
Geothermal energy
Definition
Renewable energy that is generated deep within Earth. The radioactive decay of elements amid the extremely high pressures and temperatures at depth generate heat that rises to the surface in magma and through fissures and cracks. Where this energy heats groundwater, natural eruptions of heated water and steam are sent up from below.
Term
Matter
Definition
All material in the universe that has mass and occupies space.
Term
Oxygen
Definition
The chemical element with eight protons and eight neutrons. A key element in the atmosphere that is produced by photosynthesis.
Term
Law of conservation of matter
Definition
Physical law stating that matter may be transformed from one type of substance into others, but that it cannot be created or destroyed.
Term
Hyrdogen
Definition
Hydrogen: The chemical element with 1 proton. The most abundant element in the universe. Also a possible fuel for our future economy.
Term
Element
Definition
A fundamental type of matter; a chemical substance with a given set of properties which cannot be broken down into substances with other properties. Chemists currently recognize 92 elements that occur in nature, as well as more than 20 others that have been artificially created.
Term
Nitrogen
Definition
The chemical element with seven protons and seven neutrons. The most abundant element in the atmosphere, a key element in macromolecules, and a crucial plant nutrient.
Term
Carbon
Definition
The chemical element with six protons and six neutrons. A key element in organic compounds.
Term
Atoms
Definition
The smallest component of an element that maintains the chemical properties of that element.
Term
Protons
Definition
A positively charged particle in the nucleus of an atom.
Term
Neutrons
Definition
An electrically neutral (uncharged) particle in the nucleus of an atom.
Term
Electrons
Definition
A negatively charged particle that surrounds the nucleus of an atom.
Term
Isotopes
Definition
One of several forms of an element having differing numbers of neutrons in the nucleus of its atoms. Chemically, isotopes of an element behave almost identically, but they have different physical properties because they differ in mass.
Term
Radioactive
Definition
The quality by which some isotopes "decay," changing their chemical identity as they shed atomic particles and emit high-energy radiation.
Term
Half-life
Definition
The amount of time it takes for one half the atoms of a radioisotope to emit radiation and decay. Different radioisotopes have different half-lives, ranging from fractions of a second to billions of years.
Term
Ions
Definition
An electrically charged atom or combination of atoms.
Term
Molecules
Definition
A combination of two or more atoms.
Term
Compound
Definition
A molecule whose atoms are composed of two or more elements.
Term
Carbon dioxide
Definition
A colorless gas used by plants for photosynthesis, given off by respiration, and released by burning fossil fuels. A primary greenhouse gas whose buildup contributes to global climate change
Term
Methane
Definition
A colorless gas produced primarily by anaerobic decomposition. The major constituent of natural gas, and a greenhouse gas that is molecule-for-molecule more potent than carbon dioxide.
Term
Ozone
Definition
A molecule consisting of three atoms of oxygen. Absorbs ultraviolet radiation in the stratosphere. Ozone layer.
Term
Acidic
Definition
The property of a solution in which the concentration of hydrogen ions is greater than the concentration of hydroxide (OH-) ions.
Term
Basic
Definition
The property of a solution in which the concentration of hydroxide (OH-) ions is greater than the concentration of hydrogen ions.
Term
pH
Definition
A measure of the concentration of hydrogen ions in a solution. The pH scale ranges from 0 to 14: a solution with a pH of 7 is neutral, below 7 is acidic and above 7 is basic. Because the pH scale is logarithmic, each step on the scale represents a tenfold difference in hydrogen ion concentration.
Term
Organic compounds
Definition
A compound made up of carbon atoms ( and, generally, hydrogen atoms), joined by covalent bonds and sometimes including other elements, such as nitrogen, oxygen, sulfur, or phosphorus. The unusual ability of carbon to build elaborate molecules has resulted in millions of different organic compounds showing various degrees of complexity.
Term
Polymers
Definition
A chemical compound or mixture of compounds consisting of long chains of repeated molecules. Some polymers play key roles in the building blocks of life.
Term
Hydrocarbons
Definition
An organic compound consisting solely of hydrogen and carbon atoms.
Term
Macromolecules
Definition
A very large molecule, such as a protein, nucleic acid, carbohydrate, or lipid.
Term
Proteins
Definition
A macromolecule made up of long chains of amino acids.
Term
Nucleic acids
Definition
A macromolecule that directs the production of proteins. Includes DNA and RNA.
Term
Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA)
Definition
DNA: A double-stranded nucleic acid composed of four nucleotides, each of which contains a sugar (deoxyribose), a phosphate group, and a nitrogenous base. DNA carries the hereditary information for living organisms and is responsible for passing traits. RNA: A single-stranded nucleic acid composed of four nucleotides, each contains a sugar (ribose) a phosphate group, and a nitrogenous base.
Term
Genes
Definition
A stretch of DNA that represents a unit of hereditary information.
Term
Carbohydrates
Definition
An organic compound consisting of atoms of carbon, hydrogen, and oxygen.
Term
Plastics
Definition
Synthetic human-made polymers used in numerous manufactured products.
Term
Energy
Definition
the capacity to change the position, physical composition, or temperature of matter; a force that can accomplish work.
Term
Potential energy
Definition
Energy of position.
Term
Kinetic energy
Definition
Energy of motion.
Term
First law of thermodynamics
Definition
Physical law stating that energy can change from one form to another but cannot be created or lost. The total energy in the universe remains constant and is said to be conserved.
Term
Second law of thermodynamics
Definition
Physical law stating that the nature of energy tends to change from a more-ordered state to a less-ordered state; that is, entropy increases.
Term
Energy conversion efficiency
Definition
Ratio of useful output of energy to the amount that we need to input
Term
Primary Producer/Autotroph
Definition
An organism that can use the energy from sunlight to produce its own food. Includes green plants, algae and cyanobacteria.
Term
Photosynthesis
Definition
The process by which autotrophs produce their own food. Sunlight powers a series of chemical reactions that convert carbon dioxide and water into sugar (glucose) thus transforming low-quality energy from the sun into high-quality energy the organism can use.
Term
Cellular respiration
Definition
The process by which a cell uses the chemical reactivity of oxygen to split glucose into its constituent parts, water and carbon dioxide, and thereby release chemical energy that can be used to form chemical bonds or to perform other tasks within the cell.
Term
Consumer/Heterotrophs
Definition
An organism that consumes other organisms. Includes most animals, as well as fungi and microbes that decompose organic matter.
Term
Hydrothermal vents
Definition
Location in the deep ocean where heated water spurts from the sea-floor, carrying minerals that precipitate to form rocky structures. Unique and recently discovered ecosystems cluster around these vents; tubeworms, shrimp, and other creatures here use symbiotic bacteria to derive their energy from chemicals in the heated water rather than from sunlight.
Term
Chemosynthesis
Definition
The process by which bacteria in hydrothermal vents use the chemical energy of hydrogen sulfide to transform inorganic carbon into organic compounds.
Term
Core
Definition
The innermost part of the Earth, made up mostly of iron, that lies beneath the crust and mantle.
Term
Mantle
Definition
The malleable layer of rock that lies beneath Earth's crust and surrounds a mostly iron core.
Term
Asthenosphere
Definition
Especially soft rock, melted in some areas
Term
Lithosphere
Definition
The outer layer of Earth, consisting of crust and uppermost mantle, and located just above the asthenosphere. More generally, the solid part of the Earth, including the rocks, sediment, and soil at the surface and extending down many miles underground.
Term
Crust
Definition
The lightweight outer layer of the Earth, consisting of rock that floats atop the malleable mantle, which in turn surrounds a mostly iron core.
Term
Plate tectonics
Definition
The process by which Earth's surface is shaped by the extremely slow movement of tectonic plates, or sections of crust. Earth's surface includes about 15 major tectonic plates. Their interaction gives rise to processes that build mountains, cause earthquakes, and otherwise influence the landscape.
Term
Divergent plate boundary
Definition
Area where tectonic plates push apart from one another as magma rises upward to the surface, creating new lithosphere as it cools and spreads. A prime example is the Mid-Atlantic Ridge.
Term
Magma
Definition
Molten, liquid rock.
Term
Transform plate boundary
Definition
Area where two tectonic plates meet and slip and grind alongside one another, creating earthquakes. For example, the Pacific Plate and the North American Plate rub against each other along California's San Andreas Fault.
Term
Convergent plate boundary
Definition
Area where tectonic plates converge or come together. Can result in subduction or continental collision.
Term
Subduction
Definition
The plate tectonic process by which denser crust slides beneath lighter crust at a convergent plate boundary. Often results in volcanism.
Term
Continental collision
Definition
The meeting of two tectonic plates of continental lithosphere at a convergent plate boundary, wherein the continental crust on both sides resists subduction and instead crushes together, bending, buckling, and deforming layers of rock and forcing portions of the buckled crust upward, often creating mountain ranges.
Term
Rock cycle
Definition
The very slow process in which rocks and the minerals that make them up are heated, melted, cooled, broken, and reassembled, forming igneous, sedimentary, and metamorphic rocks.
Term
Rock
Definition
A solid aggregation of minerals.
Term
Mineral
Definition
A naturally occurring solid element or inorganic compound with a crystal structure, a specific chemical composition, and distinct physical properties.
Term
Lava
Definition
Magma that is released from the lithosphere and flows or spatters across Earth's surface.
Term
Igneous rock
Definition
One of the three main categories of rock. Formed from cooling magma. Granite and basalt are examples of igneous rock.
Term
Extrusive igneous rock
Definition
When molten rock is ejected from a volcano, it cools quickly so minerals have little time to grow into coarse crystals. Ex: basalt
Term
Sediments
Definition
The eroded remains of rock.
Term
Sedimentary rock
Definition
One of the three main categories of rock. Formed when dissolved minerals seep through sediment layers and act as a kind of glue, crystallizing and binding sediment particles together. Sandstones and shale are examples. Compaction, cementation, lithification
Term
Metamorphic rock
Definition
One of the three main categories of rock. Formed by great heat and/or pressure that reshapes crystals within the rock and changes its appearance and physical properties. Marble and slate.
Term
Earthquake
Definition
A release of energy occurring as Earth relieves accumulated pressure between masses of lithosphere and which results in shaking at the surface.
Term
Volcano
Definition
A site where molten rock, hot gas, or ash erupt through Earth's surface, often creating a mountain over time as cooled laval accumulates.
Term
Landslide
Definition
The collapse and down hill flow of large amounts of rock or soil. A severe and sudden form of mass wasting.
Term
Mass wasting
Definition
The downslope movement of soil and rock due to gravity.
Term
Tsunami
Definition
An immense swell, or wave, of ocean water triggered by an earthquake, volcano, or landslide, that can travel long distances across oceans and inundate coasts.
Term
System
Definition
A network of relationships among a group of parts, elements, or components that interact with and influence one another though the exchange of energy, matter and/or information.
Term
Feedback loop
Definition
A circular process in which a system's output serves as input to that same system.
Term
Negative feedback loop
Definition
A feedback loop in which output of one type acts as input that moves the system in the opposite direction. The input and output essentially neutralize each other's effects, stabilizing the system.
Term
Positive feedback loop
Definition
A feedback loop in which output of one type acts as input that moves the system in the same direction. The input and output drive the system further toward one extreme or another.
Term
Homeostasis
Definition
The tendency of a system to maintain constant or stable internal conditions.
Term
Emergent properties
Definition
A characteristic that is not evident in a system's components.
Term
Watershed
Definition
The entire area of land from which water drains into a given river.
Term
Eutrophication
Definition
The process of nutrient enrichment, increased production of organic matter, and subsequent ecosystem degradation in a water body.
Term
Atmosphere
Definition
The thin layer of gases surrounding planet Earth.
Term
Hydrosphere
Definition
All water — salt or fresh, liquid, ice, or vapor — in surface bodies, underground, and in the atmosphere.
Term
Biosphere
Definition
The sum total of all the planet's living organisms and the abiotic portions of the environment with which they interact.
Term
Ecosystem
Definition
All organisms and nonliving entities that occur and interact in a particular area at the same time.
Term
Gross primary production
Definition
The enerfy that results when autotrophs convert solar energy to energy of chemical bonds in sugars through photosynthesis. Autotrophs use a portion of this production to power their own metabolism, which entails oxidizing organic compounds by cellular respiration.
Term
Net primary production
Definition
The energy or biomass that remains in an ecosystem after autotrophs have metabolized enough for their own maintenance through cellular respiration. Net primary production is the energy or biomass available for consumption by heterotrophs.
Term
Productivity
Definition
The rate at which plants convert solar energy to biomass. Ecosystems whose plants convert solar energy to biomass rapidly are said to have high productivity.
Term
Net primary productivity
Definition
The rate at which net primary production is produced.
Term
Nutrients
Definition
An element or compound that organisms consume and require for survival. Macro and micro
Term
Geographic information system
Definition
GIS — Computer software that take multiple types of data and overlays them on a common set of geographic coordinates. The idea is to create a complete picture of a landscape and to analyze how elements of the different datasets are arrayed spatially and how they may be correlated. A common took of geographers, landscape ecologists, etc.
Term
Model
Definition
A simplified representation of a complex natural process, designed by scientists to understand how the process occurs and to make predictions.
Term
Ecological modeling
Definition
The practice of constructing and testing models that aim to explain and predict how ecological systems function.
Term
Ecosystem services
Definition
An essential service an ecosystem provides that suports life and makes economic activity possible. For example, ecosystems naturally purify air and water, cycle nutrients, provide for plants to be pollinated by animals, and serve as receptacles and recycling systems for the waste generated by our economic activity.
Term
Nutrient cycles
Definition
The comprehensive set of cyclical pathways by which a given nutrient moves through the environment. Biogeochemical cycles
Term
Pool or reservoir
Definition
A location in which nutrients in a biogeochemical cycle remain for a period of time before moving to another pool. Can be living or nonliving entities. Synonymous with reservoir.
Term
Residence Time
Definition
In a biogeochemical cycle, the amount of time a nutrient remains in a given pool or reservoir before moving to another.
Term
Flux
Definition
The movement of nutrients among pools or reservoirs in a nutrient cycle.
Term
Source
Definition
In a nutrient cycle, a pool that releases more nutrients than it accepts.
Term
Sink
Definition
In a nutrient cycle, a pool that accepts more nutrients than it releases.
Term
Hydrologic cycle, Water cycle
Definition
The flow of water — in liquid, solid, or gaseous forms — through our biotic and abiotic environment.
Term
Evaporation
Definition
The conversion of a substance forma liquid to a gaseous form.
Term
Transpiration
Definition
The release of water vapor by plants through their leaves.
Term
Precipitation
Definition
Water that condenses out of the atmosphere and falls to Earth in droplets or crystals.
Term
Runoff
Definition
The water from precipitation that flows into streams, rivers, lakes, and ponds, and in many cases eventually into the ocean.
Term
Aquifers
Definition
An underground water reservoir
Term
Groundwater
Definition
Water held in aquifers underground.
Term
Water table
Definition
The upper limit of groundwater held in an aquifer.
Term
Carbon cycle
Definition
A major nutrient cycle consisting of the routes that carbon atoms take through the nested networks of environmental systems.
Term
Nitrogen cycle
Definition
A major nutrient cycle consisting of the routes that nitrogen atoms take through the nested networks of environmental systems.
Term
Nitrogen fixation
Definition
The process by which inert nitrogen gas combines with hydrogen to form ammonium ions which are chemically and biologically active and can be taken up by plants.
Term
Denitrifying bacteria
Definition
Bacteria that convert the nitrates in soil or water to gaseous nitrogen and release it back into the atmosphere.
Term
Haber-Bosch process
Definition
A process to synthesize ammonia on an industrial scale. Developed by German chemists Haber and Bosch, the process has enable humans to double the natural rate of nitrogen fixation on Earth and thereby increase agricultural productivity, but it has also dramatically altered the nitrogen cycle.
Term
Phosphorus cycle
Definition
Term
Relativists
Definition
Term
Universalists
Definition
Term
Instrumental value
Definition
Term
Intrinsic value
Definition
Term
Anthropocentrism
Definition
Term
Biocentrism
Definition
Term
Ecocentrism
Definition
Term
Preservation
Definition
Term
Conservation
Definition
Term
Economics
Definition
Term
Subsistence economy
Definition
Term
Capitalist market economy
Definition
Term
Centrally planned economies
Definition
Term
Ecosystem services
Definition
Term
Classical economics
Definition
Term
Neoclassical economics
Definition
Term
Cost-benefit analysis
Definition
Term
Externalities
Definition
Term
External cost
Definition
Term
Economic growth
Definition
Term
Affluenza
Definition
Term
Environmental economics
Definition
Term
Ecological economies
Definition
Term
Steady-state economies
Definition
Term
Gross Domestic Product
Definition
Term
Genuine Progress Indicator
Definition
Term
Nonmarket values
Definition
Term
Contingent valuation
Definition
Term
Market failure
Definition
Term
Ecolabeling
Definition
Term
Greenwashing
Definition
Term
Policy
Definition
Term
Public policy
Definition
Term
Free rider
Definition
A party that fails to invest in controlling pollution or carrying out other environmentally responsible activities and instead relies on the efforts of other parties to do so. A factory fails to control its emissions gets a free ride on the efforts of other factories that do make the sacrifices necessary to reduce emissions.
Term
Polluter-pays principle
Definition
Principle specifying that the party responsible for producing pollution should pay the costs of cleaning up the pollution or mitigating its impacts.
Term
Legislation
Definition
Statutory laws.
Term
Regulations
Definition
A specific rule issued by an administrative agency, based on the more broadly written statutory law passed by Congress and enacted by the President.
Term
Regulatory taking
Definition
The deprivation of a property's owner, by means of a law or regulation, of most or all economic uses of that property.
Term
National Environmental Policy Act
Definition
NEPA — A U.S. law enacted on January 1, 1970, that created an agency called the Council on Environmental Quality and required that an environmental impact statement be prepared for any major federal action.
Term
Environmental Impact Statement
Definition
A report of results from detailed studies that assess the potential effects on the environment that would likely result from development projects or other actions undertaken by the government.
Term
Environmental Protection Agency
Definition
An administrative agency created by executive order in 1970. The EPA is charged with conducting and evaluating research, monitoring environmental quality, setting standards, and enforcing those standards, assisting the states in meeting standards and goals, and educating the public.
Term
Tort law
Definition
A system of law addressing harm cause by one entity to another which operates primarily through lawsuits.
Term
Green taxes
Definition
A levy on environmentally harmful activities and products aimed at providing a market-based incentive to correct for market failure.
Term
Permit trading
Definition
The practice of buying and selling government issued marketable emissions permits to conduct environmentally harmful activities. Under a cap-and-trade system, the government determines an acceptable level of pollution and then issues permits to pollute. A company receives credit for amounts it does not emit and can then sell this credit to another company.
Term
Emissions trading
Definition
A permit-trading system for emissions in which a gov't issues marketable emissions permits to conduct environmentally harmful activities. A company receives credit for amounts it does not emit and can sell this credit to other companies.
Term
Cap-and-trade
Definition
A permit trading system in which govt determines an acceptable level of pollution and then issues polluting parties permits to pollute. A company receives credit for amounts it does not emit and can then sell this credit to other companies.
Term
Public-Private partnership
Definition
A combined effort of government and a for-profit entity, generally intended to use the efficiency of the private sector to help achieve a public policy goal.
Term
Lobbying
Definition
The expenditure of time or money in an attempt to influence an elected official.
Term
Revolving door
Definition
The movement of powerful officials between the private sector and government agencies.
Term
Customary law
Definition
International law that arises from long-standing practices, or customs, held in common by most cultures.
Term
Conventional law
Definition
International law that arises from conventions, or treaties, that nations agree to enter into.
Term
Conventions or treaties
Definition
A treaty or binding agreement among national governments.
Term
North American Free Trade Agreement
Definition
an agreement signed by the governments of Canada, Mexico, and the United States, creating a trilateral trade bloc in North America
Term
United Nations
Definition
Organization founded in 1945 to promote international peace and to cooperate in solving international economic, social, cultural, and humanitarian problems.
Term
World Bank
Definition
Institution founded in 1944 that serves as one of the globe's largest sources of funding for economic development, including such major projects as dams, irrigation infrastructure, and other undertakings.
Term
European Union
Definition
Political and economic organization formed after WWII to promote Europe's economic and social progress. As of 2007 the EU consisted of 28 member nations.
Term
World Trade Organization
Definition
Organization based in Geneva, Switzerland, that represents multinational corporations and promotes free trade by reducing obstacles to international commerce and enforcing fairness among nations in trading practices.
Term
Fresh water
Definition
Water that is relatively pure, holding very few dissolved salts.
Term
Surface water
Definition
Water located atop Earth's surface.
Term
Floodplain
Definition
The region of land over which a river has historically wandered and periodically floods.
Term
Littoral-Benthic-Limnetic zone
Definition
Littoral: The region ringing the edge of a water body. — Benthic: The bottom layer of a water body. — Limnetic: In a water body, the layer of open water through which sunlight penetrates
Term
Wetlands
Definition
A system in which the soil is saturated with water and which generally features shallow standing water with amble vegetation. These biologically productive systems include freshwater marshes, swamps, bogs, and seasonal wetlands such as vernal pools.
Term
Confined aquifer, Artesian aquifer
Definition
A water-bearing porous layer of rock, sand, or gravel that is trapped between an upper and lower layer of less permeable substrate, such as clay, The water in a confined aquifer is under pressure because it is trapped between to impermeable layers.
Term
Unconfined aquifer
Definition
A water-bearing, porous layer of rock, sand, or gravel that lies atop a less-permeable substrate. Th water in an unconfined aquifer is not under pressure because there is no impermeable upper layer to confine it.
Term
Continental shelf
Definition
Shelf: The gently sloping underwater edge of a continent, varying in width from 100 m to 1,300 km with an average slope of 1.9 m/km. Continental slope; the portion of the ocean floor that angles somewhat steeply downward connecting the continental shelf to the deep ocean basin below. Then Shelf slope break, continental slope, continental rise, oceanic ridge
Term
Pycnocline
Definition
The zone of the ocean beneath the surface in which density increases rapidly with depth. Temperature decreases.
Term
Currents
Definition
The flow of a liquid or gas in a certain direction.
Term
Upwelling
Definition
In the ocean, the flow of cold, deep water toward the surface. Upwelling occurs in areas where surface currents diverge.
Term
Downwelling
Definition
In the ocean, the flow of warm surface water toward the ocean floor. Downwelling occurs where surface currents converge.
Term
Thermohaline circulation
Definition
A worldwide system of ocean currents in which warmer, fresher water moves along the surface and colder, saltier water (which is more dense) moves deep beneath the surface.
Term
El Niño-Southern Oscillation
Definition
A systematic shift in atmospheric pressure, sea surface temperature, and ocean circulation in the tropical Pacific ocean. ENSO cycles give rise to El Nino and La Nina conditions.
Term
El Niño/La Niña
Definition
El Niño - The exceptionally strong warming of the Eastern Pacific Ocean that occurs every 2-7 years and depresses local fish and bird populations by altering the marine food web in the area.
La Niña - An exceptionally strong cooling of surface water in the equatorial Pacific Ocean that occurs every 2-7 years and has widespread climatic consequences,
Term
Oceanic acidification
Definition
The process by which today's oceans are becoming more acidic as a result of increased carbon dioxide concentrations in the atmosphere. Occurs as ocean water absorbs CO2 form the air and forms carbonic acid. Threatens to dissolve coral reefs.
Term
Photic zone
Definition
In the ocean or a freshwater body, the well-lit top layer of water where photosynthesis occurs.
Term
Pelagic
Definition
Of, relating to, or living between the surface and floor of the ocean.
Term
Benthic
Definition
Of, relating to, or living on the bottom of a water body.
Term
Coral reef
Definition
A mass of calcium carbonate composed of the skeletons of tiny colonial marine organisms called corals.
Term
Intertidal, or littoral
Definition
Of, relating to, or living along shorelines between the highest reach of the highest tide and the lowest reach of the lowest tide.
Term
Tides
Definition
The periodic rise and fall of the ocean's height at a given location, caused by the gravitational pull of the moon and sun.
Term
Salt marshes
Definition
Flat land that is intermittently flooded by the ocean where the tide reaches inland. Salt marshes occur along temperate coastlines and are thickly vegetated with grasses, rushes, shrubs, and other herbaceous plants.
Term
Mangroves
Definition
A tree with a unique type of roots that curve upward to obtain oxygen, which is lacking in the mud in which they grow, and that serve as stilts to support the tree in changing water levels. Grow on the coastlines of tropics and subtropics.
Term
Estuaries
Definition
An area where a river flows into the ocean, mixing fresh water with salt water.
Term
Troposphere
Definition
The bottommost layer of the atmosphere; it extends to 11 km above sea level.
Term
Stratosphere
Definition
The layer of the atmosphere above the troposphere and below the mesosphere.
Extends from 11 km - 50 km above sea level.
Term
Ozone layer
Definition
A portion of the stratosphere roughly 17-30 km above sea level, that contains most of the ozone in the atmosphere.
Term
Mesosphere
Definition
The atmospheric layer above the stratosphere, extending 50-80 km above sea level.
Term
Thermosphere
Definition
The atmosphere's top layer, extending upward to an altitude of 500 km
Term
Atmospheric pressure
Definition
The weight per unit area produced by a column of air.
Term
Relative humidity
Definition
The ratio of the water vapor contained in a given volume of air to the maximum amount the air could contain, for a given temperature.
Term
Convective circulation
Definition
A circular current (of air, water, magma, etc.) driven by temperature differences. In the atmosphere, warm air rises into regions of lower atmospheric pressure, where it expands and cools and then descends and becomes denser, replacing warm air that is rising. The air picks up heat and moisture near ground level and prepares to rise again, continuing the process.
Term
Weather
Definition
The local physical properties of the troposphere, such as temperature, pressure, humidity, cloudiness, and wind, over relatively short time periods.
Term
Climate
Definition
The pattern of atmospheric conditions found across large geographic regions over long periods of time.
Term
Front
Definition
The boundary between air masses that differ in temperature and moisture (and therefore density).
Term
Warm front
Definition
The boundary where a mass of warm air displaces a mass of colder air.
Term
Cold front
Definition
The boundary where a mass of cold air displaces a mass of warmer air.
Term
High-pressure system
Definition
An air mass with elevated atmospheric pressure, containing air that descends, typically bringing fair weather.
Term
Low-pressure system
Definition
An air mass in which the air moves toward the low atmospheric pressure at the center of the system and spirals upward, typically bringing clouds and precipitation.
Term
Temperature (thermal) inversion
Definition
A departure from the normal temperature distribution in the atmosphere in which a pocket of relatively cold air occurs near the ground, with warmer air above it. The cold air, denser than the air above it, traps pollutants near the ground and causes a buildup of smog.
Term
Inversion layer
Definition
In a temperature inversion, the band of air in which temperature rises with altitude (instead of falling with altitude, as temperature does normally).
Term
Hadley cells
Definition
One of a pair of cells of convective circulation between the equator and 30 degrees north and south latitude that influence global climate patterns.
Term
Ferrel Cells
Definition
One of a pair of cells of convective circulation between 30-60 degrees north and south latitude that influence global climate patterns.
Term
Polar cells
Definition
One of a pair of cells of convective circulation between the poles and 60 degrees north and south latitude that influence global climate patterns.
Term
Coriolis effect
Definition
The apparent deflection of north-south air currents to a partly east-west direction, caused by the faster spin of regions near the equator than of regions near the poles as a result of Earth's rotation.
Term
Hurricanes
Definition
A cyclonic storm that forms over the ocean but can do damage upon its arrival on land. A type of cyclone or typhoon that usually forms over the Atlantic Ocean.
Term
Tornadoes
Definition
A type of cyclonic storm in which funnel clouds pick up soil and objects and can do great damage to structures.
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