When we are on the earth's surface, we cannot comprehend the amount of water that is totally there on the earth. However, take a look at any image of the earth taken from outer space, and you will be able to appreciate truly the amount of water that is present on the earth's surface. The bluish color that you see covering the earth in these images is due to the presence of large amounts of water on the earth. In fact, the earth's surface is covered mostly with water, with land areas forming a very small percentage. The amount of water covering the earth's surface is a staggering 70 percent, with the remaining 30 percent being covered by land.
However, there is an irony to this fact of there being so much water on earth. Of all this water present, 97.5 percent is in the seas and oceans. This effectively means that this entire 97.5 percent of water in the water bodies is not potable. Only 2.5 percent of the total amount of water on earth is fresh, out of which a further 1.6 percent is at the polar ice caps and glaciers, and a further 0.36 percent present underground. This leaves a mere 0.036 percent in the lakes and rivers for our daily use.
However, there is an irony to this fact of there being so much water on earth. Of all this water present, 97.5 percent is in the seas and oceans. This effectively means that this entire 97.5 percent of water in the water bodies is not potable. Only 2.5 percent of the total amount of water on earth is fresh, out of which a further 1.6 percent is at the polar ice caps and glaciers, and a further 0.36 percent present underground. This leaves a mere 0.036 percent in the lakes and rivers for our daily use.