AP BIOLOGY

Detailed explanation-1: -The oceans are, by far, the largest reservoir of water on earth-over 96% of all of Earth’s water exists in the oceans.

Detailed explanation-2: -It is estimated that of the 332, 500, 000 cubic miles (mi3) (1, 386, 000, 000 cubic kilometers (km3)) of the world’s water supply, about 321, 000, 000 mi3 (1, 338, 000, 000 km3) is stored in oceans. That is about 96.5 percent of all Earth’s water.

Detailed explanation-3: -Most (97.5%) of it is found in the oceans; freshwater accounts for just 2.5% of the hydrosphere and most of this is locked in glaciers, permanent snow cover at the poles, and in mountainous regions. The rest is in lakes, rivers, and ground water.