Chapter 6: Water

Q&A -Ask Doubts and Get Answers



How are clouds formed?


Water vapour is formed by the process of evaporation (from oceans, rivers, lakes, ponds, soil) and transpiration goes into the air. The air containing water vapor is heated by the sun. Hot air being lighter rises up in the sky. As we go higher from the surface of the earth, it gets cooler. So, when the hot air moves up, it gets cooler and cooler. At sufficient height, the air becomes so cool that the water vapour present in it condenses to form tiny drops of water. These tiny drops of water are called droplets. These tiny droplets remain floating in the air in the sky and appear to us like clouds. Many droplets of water join together to form a bigger drop of water. Big drops become heavy and fall on earth as rain or snow. 

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