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