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| molecules of liquid water absorb energy and change to a the gas state. Water evaporates from oceans, lakes, and streams. |
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| The process by which a gas changes to a liquid. Water droplets collect around particles of dust in the air and form clouds. |
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| Water in the clouds grow larger and heavier. Heavy drops fall back to the Earth as either rain, sleet, hail, or snow. |
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| Producers use carbon dioxide to go through photosynthesis. In the process they release oxygen for other organisms to use. |
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| Changing free nitrogen in the air to usable form of nitrogen by other organisms. |
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| Bacteria live in nodules on some plant roots. The bacteria fix the nitrogen so that it is usable by plants. |
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| Amount of free nitrogen in the air we breath. |
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| What nitrogen does for organisms. |
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| The building block of all living matter. |
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