Cycles of Matter

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The part of the water cycle when clouds are created is

Decomposers break down dead plants and animals that have nitrogen in them.

The breaking down of dead organisms is called

Anything that has mass and takes up space is

Plants take in fixed nitrogen from the air.

Photosynthesis, respiration, and decomposition are part of the

The process of changing free nitrogen into the usable form is called

The Earth's atmosphere is made of 78%