Question

The major reservoir of carbon on earth is..........

Answer 1

The amount of carbon in the atmosphere is surprisingly small. Sizes of reservoirs are given in mass units. The ocean is near 40,000 GtC; the biosphere is near 610 GtC; and, depending on how it is defined, soil is almost 1600 GtC. Ocean is considered as a major reservoir for carbon dioxide since it is so large a reservoir and is in intimate contact with the air. The atmosphere's dependency on the ocean Reservoir has a drawback: if the ocean reacts to climate change by giving off a small proportion of its carbon dioxide, the atmosphere, with its low concentrations of carbon dioxide, greatly amplifies the effect.

So the correct option is 'ocean'.