Stack #68128
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| water cycle | the continuous process by which water moves from Earth's surface to the atmosphere and back, passing through the living and nonliving parts of the environment
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| nitrogen cycle | the process by which nitrogen is removed from the atmosphere, fixed in the soil by bacteria, incorporated into other living things, and then released back into the atmosphere
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| carbon cycle | the system in which carbon is transferred from Earth's interior to the atmosphere, oceans, crust, and living things
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| nitrogen fixation | the process of changing free nitrogen gas into a usable form of nitrogen
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| evaporation | process by which molecules of liiquid water absorb energy and change to the gas state
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| condensation | the change from the gaseous to the liquid state of matter
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| precipitation | forms of water such as rain, snow, sleet or hail that fall from clouds and reach Earth's surface
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| groundwater | water that fills the cracks and pores in underground soil and rock layers
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| drought | a water shortage caused by long periods of low precipitation in a particular area
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| photosynthesis | process by which plants and some other organisms capture light energy and use it to make food from carbon dioxide and water
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| greenhouse gases | gases in the atmosphere that trap heat
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| global warning | a gradual increase in the temperature of Earth's atmosphere
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| ozone | a form of oxygen that has three oxygen atoms in each molecule instead of the usual two
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| ozone layer | the layer of the upper atmosphere about 30 kilometers above Earth's surface where ozone is concentrated
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| chlorofluorocarbons | one of a group of chlorine compounds formerly used in air conditioners and refrigerators
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Created by:
Triana Silliman
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