Discussion
Which reservoir holds the great majority of the Earth's water?
Answer: B
The oceans hold about 97 per cent of all water, with ice sheets and groundwater making up most of the remainder and the atmosphere containing only about a thousandth of one per cent. Despite that tiny share the atmosphere is where the whole cycle is driven, because its water turns over every ten days. Reservoir size and turnover rate are quite different measures of importance. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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