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Definition
| The force exerted by the weight of air molecules. |
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| A cold-blooded vertebrate animal. Examples: frogs, toads, newts, and salamanders. |
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| The scientific study of human activity in the past. |
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| The powdery residue left after the burning of a substance. |
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| A small rocky body orbiting the sun. |
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| The region of interplanetary space between Mars and Jupiter where most asteroids are found. |
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| The envelope of gases surrounding the earth or another planet or moon. |
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| The basic unit of a chemical element. |
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| A meal that provides you with all your nutritional needs. |
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Definition
| An instrument for measuring air pressure. |
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Definition
| The scientific study of living organisms. |
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| A warm-blooded egg-laying vertebrate with feathers, wings, and a beak. Examples: parrots, woodpeckers, robins. |
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| The scientific study of plants. |
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| A tough, usually flexible but sometimes fairly rigid layer that surrounds some types of cells. It is found in plant cells and fungus cells but not in animal cells. |
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| A compound or substance that has been purified or prepared, especially artificially. |
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| The scientific study of the substances of which matter is composed. |
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| The weather conditions prevailing in an area in general or over a long period. |
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| A thing that is composed of two or more separate elements; a mixture. |
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| A trail of condensed water from an aircraft or rocket at high altitude, seen as a white streak against the sky. |
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Definition
| A large, bowl-shaped cavity on the surface of a planet or a moon caused by an explosion or by the impact of a meteorite. |
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Definition
| The curved shape of the waxing or waning moon. |
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Definition
| The outermost solid shell of a rocky planet or natural satellite. |
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Definition
| A pure chemical substance consisting of one type of atom. Examples include hydrogen, helium, carbon, oxygen, iron, copper, gold, mercury, and lead. |
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Definition
| The process of eroding or being eroded by wind, water, or other natural agents. |
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| The available facts or information indicating whether a belief or proposition is true or valid. |
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| A scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact. |
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| Something outside of our solar system. |
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| A scale of measurement for temperature. In this scale, water freezes at "32 degrees" and water boils at "212 degrees." |
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Term
| first quarter (of the moon) |
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Definition
| A phase of the moon in which the moon's right half is visible to observers in Earth's Northern hemisphere. |
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Definition
| A limbless cold-blooded vertebrate animal with gills and fins and living wholly in water. |
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| A colored, sometimes scented, part of a plant that contains its reproductive organs. |
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| A series of organisms each dependent on the next as a source of food. |
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| A natural fuel such as coal or gas, formed in the geological past from the remains of living organisms. |
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Definition
| A phase of the moon in which the moon is fully visible. |
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| A state of matter; an airlike fluid substance which expands freely to fill any space available. |
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Definition
| A large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune. |
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Definition
| The study of the physical features of the earth and its atmosphere, and of human activity as it affects and is affected by these. |
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| A word meaning that the observable part of the moon is greater than a semicircle and less than a circle. |
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Definition
| The gradual increase in the temperature of the earth's atmosphere, believed to be due to the greenhouse effect. |
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| A British primatologist, ethologist, and anthropologist. She is considered to be the world's foremost expert on chimpanzees. She was born in 1934, so she was 79 years old in 2013. |
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| The force that attracts an object toward the center of the earth, or toward any other physical body having mass. |
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| The phenomenon whereby the earth's atmosphere traps solar radiation, caused by the presence in the atmosphere of gases such as carbon dioxide, water vapor, and methane that allow incoming sunlight to pass through but absorb heat radiated back from the earth's surface. |
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Definition
| An instrument for measuring the humidity of the air or a gas. |
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Definition
| Rock which has solidified from lava or magma. |
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Term
| inner core (of the earth) |
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Definition
| The Earth's innermost part; a primarily solid ball. |
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Definition
| An atom or molecule with a net electric charge due to the loss or gain of one or more electrons. |
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Definition
| The layer of the earth's atmosphere that contains a high concentration of ions and free electrons and is able to reflect radio waves. |
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Definition
| A narrow, variable band of very strong, predominantly westerly air currents encircling the globe several miles above the earth. |
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Definition
| The international definition for the edge of space. Approximately 100km (or 62 miles) above the Earth's surface. |
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Term
| last quarter (of the moon) |
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Definition
| A phase of the moon in which the moon's left half is visible to observers in Earth's Northern hemisphere. |
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Definition
| The angular distance of a place north or south of the earth's equator. |
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| Hot molten or semifluid rock erupted from a volcano or fissure, or solid rock resulting from cooling of this. |
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Definition
| The series of changes in the life of an organism, including reproduction. |
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| Having a consistency like that of water or oil. It flows freely but it has constant volume. |
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| The angular distance of a place east or west of the meridian at Greenwich, England. |
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| The action of measuring something. |
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| The region of the earth's atmosphere above the stratosphere and below the thermosphere. The word derives from the Greek words "mesos," meaning "middle," and "sphaira," meaning "ball." |
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| An optical instrument used for viewing very small objects, typically magnified several hundred times. |
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| Any of numerous small celestial bodies that move around the sun. |
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Definition
| A natural satellite of a planet, especially the Earth's Moon. |
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Definition
| A small flowerless green plant that lacks true roots. |
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| A line of mountains connected by high ground. Examples: Rcoky Mountains, Himalayas. |
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Definition
| A subatomic particle of about the same mass as a proton but without an electric charge. |
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Definition
| A phase of the moon in which the moon is not visible. This phase concludes with the appearance of the first crescent. |
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Definition
| Any of the gaseous elements helium, neon, argon, krypton, xenon, and radon. These elements are relatively nonreactive, because they have a complete electron shell. They have little tendency to gain or lose electrons. |
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Term
| nonrenewable energy source |
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Definition
| Energy sources such as fossil fuels which require drilling or mining. Energy sources with a limited supply. Examples: oil, coal, natural gas, uranium. |
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Definition
| The positively charged central core of an atom, containing most of its mass. |
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Definition
| The process of providing or obtaining the food necessary for health and growth. |
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Definition
| The action or process of observing something or someone carefully or in order to gain information. Also, the ability to notice significant details. |
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Definition
| The curved path of an object or spacecraft around a star, planet, or moon. (Also: the path of an electron around a nucleus.) |
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Term
| outer core (of the earth) |
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Definition
| A liquid layer composed of iron and nickel which lies above the Earth's solid inner core. |
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Definition
| A layer in the earth's stratosphere containing a high concentration of ozone. The layer absorbs large amounts of solar ultraviolet radiation, preventing it from reaching the Earth's surface. |
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Definition
| A table of the chemical elements arranged in order of atomic number, usually in rows. |
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Definition
| A special type of fossilized remains of terrestrial vegetation. Deriving in part from the Greek word "petro," meaning "rock" or "stone." |
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Definition
| A celestial body moving in an elliptical orbit around a star. |
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Definition
| Rain, snow, sleet, or hail that falls to the ground. |
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Definition
| Evidence or argument establishing or helping to establish a fact or the truth of a statement. |
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Definition
| A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron. |
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Definition
| Rock that has formed from sediment deposited by water or air. |
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Definition
| A flowering plant's unit of reproduction, capable of developing into another such plant. |
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Definition
| A young plant, especially one raised from seed and not from a cutting. |
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Definition
| An instrument that measures and records details of earthquakes, such as force and duration. |
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Definition
| The hard structure (bones and cartilages) that provides a frame for the body of an animal. |
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Definition
| A state of matter; neither liquid nor gaseous. Shape and volume are relatively stable; its parts tend to be packed together much closer than the particles in a gas or liquid. |
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Definition
| An energy source consisting of renewable resources. Examples: sunlight, wind, rain, tides, waves and geothermal heat. |
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Definition
| A cold-blooded vertebrate animal. Examples: snakes, lizards, crocodiles, turtles, and tortoises. |
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Definition
| A system of organs for taking in oxygen and giving off carbon dioxide. |
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Definition
| The layer of the earth's atmosphere above the troposphere. |
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Definition
| A word meaning "smaller than an atom." For example, this word can describe protons, neutrons, and electrons. |
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Definition
| The highest point of a hill or mountain. |
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Definition
| An optical instrument designed to make distant objects appear nearer. |
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Definition
| An instrument for measuring and indicating temperature. |
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Definition
| A word meaning "poisonous." It derives from the Latin word "toxicum," meaning "poison." |
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Definition
| The lowest region of the atmosphere, extending from the earth's surface to a height of about 6–10 km. |
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Definition
| The main woody stem of a tree as distinct from its branches and roots. |
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Definition
| The state of the atmosphere at a place and time as regards heat, cloudiness, dryness, sunshine, wind, rain, etc. |
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Definition
| A proposed explanation made on the basis of limited evidence as a starting point for further investigation. |
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Definition
| The crust and upper mantle of the earth. |
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Definition
| Hot fluid or semifluid material below or within the earth's crust from which lava and other igneous rock is formed by cooling. |
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Definition
| A warm-blooded vertebrate animal; it has hair or fur; the mothers can give milk to their babies. |
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Definition
| The scientific study of the processes and phenomena of the atmosphere, especially as a means of forecasting the weather. |
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Definition
| A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound. |
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