AP BIOLOGY

Detailed explanation-1: -About 71 percent of the Earth’s surface is water-covered, and the oceans hold about 96.5 percent of all Earth’s water. Water also exists in the air as water vapor, in rivers and lakes, in icecaps and glaciers, in the ground as soil moisture and in aquifers, and even in you and your dog.

Detailed explanation-2: -Water covers about 71% of the Earth’s surface. Of this 71%, about 97.3% of water is saltwater in the oecans and is not suitable for direct human consumption.

Detailed explanation-3: -Although water occupies about 71% of the earth’s surface, all of it is not potable water. Most of the water is available in the form of seas and oceans which is salty in nature. This saline water has its limitations and cannot be used for many purposes.

Detailed explanation-4: -With 70 percent of its planetary surface covered by water, Earth is unique in the solar system. Earth is the only planet known to have indigenous life; yet water, mostly as water ice, is found throughout the solar system.