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How many reservoirs are there in the oxygen cycle?

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in Basic Civil Engineering by (111k points)
How many reservoirs are there in the oxygen cycle?

(a) 3

(b) 2

(c) 5

(d) 4

I have been asked this question during a job interview.

I'd like to ask this question from Various Cycles of Environment topic in chapter Other Major Topics in Civil Engineering of Basic Civil Engineering

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Correct choice is (a) 3

Explanation: The three main reservoirs are the atmosphere (air), biosphere (the global sum of all ecosystems) and Earth’s crust.

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