1.- The Earth, a watery planet

If you were to travel into outer space and look back at the earth, it would look blue. Earth is called the blue planet because it is mostly covered with water. In fact, over seventy percent of the surface is covered by ocean water.

2.- Water distribution

The oceans contain ninety-seven percent of Earth's water. The other three percent is fresh water. This water is found on and under the ground. It is also contained in the polar ice caps. The atmosphere also holds a tiny fraction of Earth's fresh water.