How much of the world's water is estimated to exist as fresh water?

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96.5%

70%

2.5%

answer is C.

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Detailed Solution

2.5% of the world's water is estimated to exist as fresh water.
Water covers around 71% of the Earth's surface, with continents and islands accounting for the remaining 29%. The seas hold 97.5 per cent of all Earth's water as salt water, with the remaining 2.5 per cent made up of freshwater lakes and frozen water locked up in glaciers and polar ice caps. Almost all that fresh water condenses into ice, accounting for 69 per cent. Aside from the water that exists in the form of ice, there is also an enormous amount of water beneath the Earth's surface. It is believed that if all of the Earth's freshwater were collected as a single mass, it would have a volume of 1,386 million cubic kilometres.

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