1. WATER_A NATURAL RESOURCE

2. Sources of water Forms of water Evaporation of water Pollution of water Potable water Water management Rainwater harvesting

3. World water day -22 March. Sources of water-wells,tube wells,ponds,river s,lakes,streams. Forms of water- liquid,gaseous,sol id.

4. Evaporation of water-the changing of liquid in a gaseous state on heating is called evaporation of water. Water evaporates at 0to100C

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

6. Pollution of water Causes of pollution Efforts to reduce pollution

7. Potable water Filtration Chlorination Supplying water

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

9. Rainwater harvesting- When rainwater is collected and used later,it is called rainwater harvesting-