Water cycle in nature

Water cycle in nature

               It is estimated that about 4/5 of the earth's surface is covered with water. The region covered with water is known as the hydrosphere. The science dealing with the water of the earth, their distribution on the surface and underground etc., is known as Hydrology.

                    It is estimated that the hydrosphere contains about 14,60,000 cubic km of water. Of this 97.3% is in the oceans and the seas. only 2.7% of water is found in glaciers, fresh water lakes, rivers and underground water . Of this only 1% is potable.

                       Water cycle is the circulation of water from the earth's surface to the atmosphere and then back to earth. The water we actually use comes back to us again and again. From seas, rivers, ponds and lakes, water evaporates due to the heat of the sun and forms clouds. The clouds thus formed are carried in the atmosphere to long distances and on cooling come down as rain. This water cycle is continuous

                        The continuous circulation of water from the surface of the earth to the atmosphere and back to the earth, involving process of evaporation and condensation is called the water cycle or hydrologic cycle.