Transcription of matkas - NCERT
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matkas - NCERT
You already know that three-fourth of theearth s surface is covered with water, but onlya small proportion of it accounts forfreshwater that can be put to use. Thisfreshwater is mainly obtained from surfacerun off and ground water that is continuallybeing renewed and recharged through thehydrological cycle. All water moves within thehydrological cycle ensuring that water is arenewable might wonder that if three-fourth ofthe world is covered with water and water isa renewable resource, then how is it thatcountries and regions around the globe sufferfrom water scarcity? Why is it predicted thatby 2025, nearly two billion people will live inabsolute water scarcity?WATER SCARCITY AND THE NEED FOR WATERCONSERVATION AND MANAGEMENTG iven the abundance and renewability ofwater, it is difficult to imagine that we maysuffer from water scarcity.
the materials used, dams are classified as timber dams, embankment dams or masonry dams, with several subtypes. According to the height, dams can be categorised as large dams and major dams or alternatively as low dams, medium height dams and high dams. Find out more about any one traditional method of building dams and irrigation works.
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