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What is biogeochemical cycle? Explain it...

What is biogeochemical cycle? Explain its types.

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Circulation of nutrients within the ecosystem or biosphere is known as biogeochemical cycles and also called as "cycling of materials.. There are two basic types,
1. Gaseous cycle - It includes atmospheric Oxygen, Carbon and Nitrogen cycles.
  2. Sedimentary cycle - It  includes the cycles of Phosphorus, Sulphur and Calcium - Which are present as sediments of Earth.
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