Earth is a closed system. That means the amount______ of rocks, metals, carbon, nitrogen, oxygen, and water on Earth______ . So, it is essential that biogeochemical cycles______ these materials as they move through Earth's subsystems.

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Answer:

The Earth is a "closed system" which means that the amount of rocks, Ā carbon, metals, nitrogen, water and oxygen on earth remains constant. So it is essential that "biogeochemical cycles renew these materials" as they move through the Earth's subsystems.

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