The water cycle is also known as the hydrological cycle

The water cycle is also known as the hydrological cycle. The water is an indispensable source of energy. They form around 80 percent of the body weight. It helps to make macro molecules, transport of materials, solubilize the chemicals and involve in chemical reactions. The photosynthesis is the process which liberates oxygen with the photolysis of water. There are different types of water cycles. They can be global or biological water cycle. The global water cycle is larger as compared to the biological water cycle. In the global water cycle there occurs a process of evaporation and precipitation. All the oceans, rivers, ponds and lakes lose water through the process of evaporation. The atmosphere has 0.13 multiply by 10 raise to power 20 G of water vapors. The clouds are formed by the higher altitudes, cool and condense water vapors. The clouds move and precipitate later on. The precipitation occurs in many forms. It occurs as snow, rain and hail. The total precipitation present in the world is 4.46 multiply by 10 raise to power 20 G of water vapor. The atmosphere must be filled with the water vapor multiple times in a year. The snow form is deposited in the polar and alpine areas. In the summer season the ice melts. The rainfall occurs everywhere on the earth. The rivers are formed by the melting of snow. The water goes into the soil and becomes underground. The rivers take excess of water into oceans. The underground water is used by humans in the agriculture. The plants are dependent on the water which is present in the soil. The underground water also moves into the ocean. The whole of water does not move to ocean. The large proportion of water is formed by the polar ice, snow and the underground water. The biological water cycle is relatively smaller. The water enters into the human beings and it is returned back to the environment. The plants and animals which reside in the water absorb the water from nearby areas. Some of the water is excreted out and the rest of water is released when the organism dies. The plants which occur on land absorb the water from the roots. They loss the water mainly through the process of transpiration and makes the climate cool during summer and makes it warmer during the winter season. It also leads to rainfall. It plays an important role in the deciding of weather in a particular area. The animals which live on land take ware from ponds, rivers and lakes etc. The water requirement is also met by the food. The water is lost through the urine and sweat. The rest of water is released when the organism dies.