lw07262001 lw07262001

27-11-2018
Biology

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The water cycle is a biochemical cycle that is a closed system

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talanna394 talanna394

28-11-2018

Biogeochemical Cycles. The Earth is a closed system for matter, except for small amounts of cosmic debris that enter the Earth's atmosphere. ... Many elements cycle through ecosystems, organisms, air, water, and soil.

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