fossil fuel - a fuel formed from the remains of organisms, nitrogen cycle - the movement of nitrogen through the living and nonliving parts of the environment, carbon cycle - the movement of carbon through the living and nonliving parts of the environment, water cycle - the movement of water through the living and nonliving parts of the environment, condensation - the change of state from a gas to a liquid, evaporation - the change of state from a liquid to a gas, nitrogen fixation - a process by which bacteria convert nitrogen gas into a usable form, precipitation - any form of water that falls from the clouds to Earth's surface, transpiration - the process by which water is lost from the leaves of plants, groundwater - the water that is stored in the ground, runoff - the water that flows over the ground surface,

Cycles of Matter

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