Biogeochemical cycles

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Presentation transcript:

Biogeochemical cycles Nitrogen Cycle Biogeochemical cycles

The Nitrogen Cycle All organisms require nitrogen to make amino acids, which in turn are used to build proteins. 78% of the Earth’s atmosphere There are certain bacteria that can convert nitrogen gas into ammonia. – This is called Nitrogen Fixation Other soil bacteria convert nitrates into nitrogen gas – This is called Denitrification.

Phosphorus Cycle Phosphorus doesn’t enter into the atmosphere like water, carbon, and nitrogen. Most of the phosphorus comes from rock and soil minerals.