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Quarter 4 Study Guide-Science
This will help you study for the exam next week in science!
82
Science
8th Grade
05/24/2007

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Term
Supernova
Definition
A gigantic explosion that can cause the death of a star.
Term
Pulsar
Definition
A spinning neutron star that emits rapid pulses of energy.
Term
Apparent Magnitude
Definition
The brightness of a star as seen from Earth.
Term
Nitrogen
Definition
78% of the atmosphere is made up of what gas?
Term
Quasar
Definition
A very bright, starlike object that generates immense energy.
Term
Biodegradable
Definition
Something that can be broken down by living organisms.
Term
Absolute Dating
Definition
The method geologists use to determine the age of a fossil or rock in years.
Term
Tectonic Plates
Definition
The lithosphere is divided into pieces called _______ ________.
Term
Irregular Galaxy
Definition
What type of galaxy is this?[image]
Term
Silicon, Oxygen, and Magnesium
Definition
What is the mantle composed of?
Term
Aluminum
Definition
The crust is composed largely of silicon, oxygen, and ______.
Term
The Core
Definition
What is composed of mainly the metal iron.
Term
Troposphere
Definition
The layer in the atmosphere in which we live, and where weather occurs.
Term
Thermosphere
Definition
The hottest layer in Earth's atmosphere.
Term
Mesosphere
Definition
The coldest layer of the atmosphere. Located above the stratosphere.
Term
Stratosphere
Definition
The layer in the atmosphere located above the troposhpere.
Term
Convection
Definition
The transfer of thermal energy by the circulation or movement of a liquid or gas.
Term
Conduction
Definition
The transfer of energy as heat through a material.
Term
Radiation
Definition
The transfer of energy as electromagnetic waves.
Term
Convection Current
Definition
The continuous cycle of warm air rising and cool air sinking.
Term
Nitrogen and Oxygen
Definition
The atmosphere is made up mainly of what two gases?
Term
The Ozone Layer
Definition
What protects life on Earth from damage caused by UV radiation from the sun?
Term
Ocean Currents
Definition
Streamlike movements of water that are either surface currents or deep currents.
Term
Surface Currents
Definition
Horizontal, streamlike movements of water that occur at or near the surface of the ocean driven mainly by winds.
Term
Deep Currents
Definition
Streamlike movements of water far below the ocean surface that are driven by cold water that sinks and flows near the ocean floor.
Term
Fresh Water
Definition
2.8% of the Earth's hydrosphere is made up of what?
Term
Millimeters to Centimeters per year
Definition
Tectonic plates move arund Earth's surface at what rate?
Term
Volcanoes
Definition
This is formed when magma rises from Earth's interior to Earth's surface where it solidifies.
Term
Erosion
Definition
The Grand Canyon was formed by this process when soil and sediment was carried from one location to another.
Term
Aquifers
Definition
Bodies of rock below the ground that stores groundwater.
Term
True
Definition
True or False: The largest resevoir of water on the Earth is the global ocean.
Term
Liquid water, a suitable habitat, and a continuous supply of energy.
Definition
What are the three MAIN things an organism needs to survive?
Term
Decomposition
Definition
During this process, some bacteria release nitrogen back into the soil in a form that plants can use.
Term
The Rock Cycle
Definition
What cycle does this picture represent?[image]
Term
A few centimeters or millimeters per year
Definition
The rate that the tectonic plates move along the earth's surface
Term
Stratosphere
Definition
The lowest layer of the earth's atmosphere.
Term
Ozone
Definition
Block harmful ultraviolet radiation from the sun
Term
Convection
Definition
The transfer of thermal energy by circulation of a fluid.
Term
Nitrogen fixing bacteria.
Definition
Responsible for changing nitrogen into a form that plants can use.
Term
Transpiration
Definition
A way that plants release water vapor into the atmosphere.
Term
Percolation
Definition
How water seeps into the ground.
Term
mantle
Definition
The thickest layer of the earth.
Term
Conduction
Definition
The transfer of energy theough a material
Term
carbon cycle
Definition
Photosynthesis is a part of this cycle.
Term
The movement of tectonic plates
Definition
Earthquakes and volcanoes are result from this
Term
Erosion
Definition
A process that reshapes the earth by the movement of soil and sediment from one location to another
Term
ocean conveyer belt
Definition
The global patterns of ocean currents
Term
Silicon,oxygen and aluminum
Definition
makes up most of the earth's crust.
Term
EM radiation
Definition
How energy from the sun reaches the earth
Term
To get energy
Definition
The reason decomposers, such as bacteria and insects break down dead plants and animals
Term
from alge to fish then to wading birds
Definition
In a typical freshwater system, the way energy flows
Term
Ammonia
Definition
In the nitrogen cycle, bacteria in nitrogen fixing plants convert atmospheric nitrogen into this chemical compond
Term
protecting habitats
Definition
A way to maintain biodiversity
Term
use natural pest control
Definition
How farmers can prevent the harming of benifical insects
Term
reuse & recycle
Definition
It helps in using fewer natural resources and reducing wastes
Term
biodegradable
Definition
The process where something can be broken down by living organisms
Term
exotic species
Definition
The name of an animal or plant when bringing it into an area where it is not from
Term
falling water, tides, wind & solar energy
Definition
4 examples of renewable energy
Term
Chemical, thermal and noise
Definition
The names of three major catagories of pollution
Term
organic farming
Definition
How farmers can help the environment
Term
It will continue expanding for ever
Definition
What will keep happening in the distant future of the universe
Term
it will be all used up - stars will eventually die and no new stars will form
Definition
What will eventually happen to the energy in the universe
Term
advances in farming and medicine
Definition
What are the two major factors accounting for human population growth?
Term
spiral, elliptical, and irregular
Definition
What are the shapes of the three major types of galaxies?
Term
black hole or neutron star
Definition
After a supernova explosion, the core of a large star will form one of these
Term
temperature
Definition
The color of a star depends on this
Term
prototype
Definition
The first phase of star formation
Term
main sequence
Definition
A star spends most of its life in this stage
Term
red giant
Definition
a star that has used up most of its hydrogen fuel expands and becomes this
Term
white dwarf
Definition
The final phase of a normal size star like our sun
Term
main sequence blue star
Definition
this type of star is the hottest
Term
14 Billion years
Definition
The approximate age of the universe
Term
marine fossils
Definition
Scientists can reconstruct ancient coastlines with the aid of what
Term
400 million years ago
Definition
trilobytes when extinct how many years ago
Term
composition and temperature
Definition
what does the spectrum of a star give us imformation about
Term
Whth a huge explosion
Definition
How did the universe begin?
Term
half-life
Definition
What is the time for 1/2 of a radioactive element to decay?
Term
Index fossil
Definition
The name for a fossil that is distinct, abundant and widespread
Term
The botton layers
Definition
The oldest layers of rock are found here.
Term
trace fossil
Definition
preserved evidence of ancient animal activity
Term
trace fossil
Definition
preserved evidence of ancient animal activity
Term
trace fossil
Definition
preserved evidence of ancient animal activity
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