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Cycles of Matter

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The cycling of water from Earth's surface into the atmosphere and back.   Water Cycle  
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The cycling of carbon and oxygen through an ecosystem by producers and consumers.   Oxygen/Carbon dioxide Cycle  
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The cycling of free nitrogen into fixed nitrogen and back to free nitrogen.   Nitrogen Cycle  
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Water that falls back to earth; ex: rain, hail, snow   precipitation  
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When liquid water is turned into water vapor   evaporation  
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Water vapor cools into tiny liquid water droplets, forming clouds.   condensation  
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Take in carbon dioxide, release oxygen into the atmosphere.   plants  
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Take in oxygen, release carbon dioxide into the atmosphere.   animals  
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21% of atmospheric gases   oxygen  
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78% of atmospheric gases   nitrogen  
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0.04% of atmospheric gases   carbon dioxide  
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Energy from this powers the water cycle   Sunlight  
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The sun heats liquid water into this invisible gas   water vapor  
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Bacteria on nodules on plant roots "fix" nitrogen to other elements to form compounds that are usable by living things.   nitrogen fixing bacteria  
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Bacteria that separate nitrogen from compounds and it returns to the atmosphere as "free" nitrogen.   nitrogen freeing bacteria  
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