What are biogeochemical cycles? Explaining the general features describe the nitrogen cycle using a neat diagram.

A biogeochemical cycle or substance turnover or cycling of substances is a pathway by which a chemical substance moves through biotic  and abiotic  compartments of Earth. There are biogeochemical cycles for carbon, oxygen, nitrogen, phosphorus, sulfur, and water; and there are human-induced cycles such as those for mercury and atrazine. In some cycles there are reservoirs where a substance remains for a long period of time .

There are many biogeochemical cycles that are currently being studied for the first time as climate change and human impacts are drastically changing the speed, intensity, and balance of these relatively unknown cycles. These newly studied biogeochemical cycles include

the mercury cycle, and

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