WATER_A NATURAL RESOURCE

• Sources of water• Forms of water• Evaporation of water • Pollution of water• Potable water• Water management• Rainwater harvesting

• World water day -22 March.

• Sources of water-wells,tube wells,ponds,rivers,lakes,streams.

• Forms of water-liquid,gaseous,solid.

• Evaporation of water-the changing of liquid in a gaseous state on heating is called evaporation of water.

• Water evaporates at 0to100C

• Ways to prevent evaporation of water-• Use of cetyl alcohol• Use of closed pipes• Use of plastic covers

• Pollution of water

• Causes of pollution

• Efforts to reduce pollution

• Potable water• Filtration• Chlorination• Supplying water

• Water management• Taking care on a personal level• Reusing water after suitable treatment• Reopening of old wells

• Rainwater harvesting-

• When rainwater is collected and used later ,it is called rainwater harvesting-