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| air surrounding earth made of gases |
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| model describing how carbon molecules move between the living and nonliving world |
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| process in which producers make energy-rich nutrient molecules from chemicals |
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| process that takes place when a gas changes to a liquid |
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| process that takes place when a liquid changes to a gas |
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| model describing how nitrogen moves from the atmosphere to the soil, to living organisms, and back to the atmosphere |
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| process in which some types of bacteria in the soil change nitrogen gas into a form of nitrogen that plants can use |
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| model describing how water moves from the earths surface to the atmosphere and back to the surface again |
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