Multiple choice

Bio-geochemical cycle of which element has atmospheric phase:

  1. carbon

  2. sodium

  3. phosphorus

  4. magnesium
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A Correct answer
Explanation

Among the elements listed, only carbon has a significant atmospheric phase in its biogeochemical cycle - as CO2 in the atmosphere. Sodium, phosphorus, and magnesium cycle primarily through rocks, water, and organisms without a major atmospheric reservoir. Carbon cycles through atmosphere (CO2), oceans (dissolved CO2, carbonates), biosphere, and lithosphere.

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