Water — Science STD 6 — Question

Water on heating turns into water vapour. Water vapour on cooling gives water again. The change of water from one form to other form over and over again makes the water cycle in nature.
The sun heats up and evaporates the water from oceans, .ponds, lakes and rivers. This water vapour being lighter is carried up by the air. This water vapour gets cooled at height and water droplets are formed. These water droplets form a cloud. When these water droplets in the cloud come close together, they form drops of water. These drops of water may fall on the earth as rain.
The rain is absorbed by the soil. A part of rain water collected in the rivers flows into the sea, where again the evaporation occurs. This completes the water cycle.
Thus, now we know how water gets circulated between the oceans and land through evaporation, transpiration, precipitation and its downhill flow by different routes. This process of circulation of water is known as water cycles. Water cycle helps in maintaining continuous supply of fresh water to all living things on land. No life on land would have been possible without water cycle.