“World cannot survive without water and morality cannot exist without rain”
As thirukkural quotes, water is the most important resource in the world. Over 90% of the world’s supply of fresh water is in Antarctica. You must know that 85% of the world population lives in the driest half of the planet. Now we shall learn about the hydrosphere in detail.
Water is the most common substance found on earth. It is an important constituent of all life forms on the earth. Hydrosphere is one among the four spheres of the earth. The hydrosphere includes the water on the surface of the earth, the water below the surface called ground water and the water in the atmosphere above earth’s surface. Oceans, rivers, lakes and glaciers form part of surface water. There is substantial amount of water under the surface of the earth. The atmosphere has water in all the three forms. The total amount of water on the earth does not change over time. Water is constantly in motion within the spheres of the earth which is being transformed and reused all over the earth. The earth’s hydrosphere, thus, acts as a closed system.