The plants and animals that live and then die are the bio part; the earth that they decompose into comprises the geo part; and the process by which organic matter returns to the chemical elements in the earth is explained by the chemical part. There are four biogeochemical cycles, and each of them returns to the earth important elements that are required in living organisms.the four cycles include (a) The water cycle(b)The Carbon Cycle ,(c) The phosphorous cycle, (d) The Nitrogen cycle.
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Last date updated on July, 2014