Discussion
Roughly what fraction of the Earth's surface is covered by ocean?
Answer: B
Correct answer: about 71 per cent
Just over seventy per cent of the surface is ocean, and that dominance drives much of the system: the ocean holds vastly more heat than the atmosphere, absorbs the bulk of the energy imbalance and most of the added carbon dioxide, and supplies the water vapour on which the greenhouse effect and the hydrological cycle depend.
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