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www.GOALias.blogspot.comappreciate the actual amount of wateravailable for human use? Does thefinding worry you? Discuss this in yourclass.16.2 F16.2 FORMSOF WATERAre you afraid that continuous use willsome day exhaust all the water availablefor use? You know that water on theearth has been maintained for millionsof years by various processes whichmake the water cycle. You have studiedthe water cycle in Class VI. Write in yourown words what you know about thewater cycle.You know that when water circulatesthrough the water cycle it can be foundin all the three forms, i.e., solid, liquidand gas — at any given time somewhereon the earth. The solid form, snow andice, is present as ice caps at the poles ofthe earth, snow-covered mountains andglaciers. Liquid water is present inoceans, lakes, rivers, and evenunderground. The gaseous form is thewater vapour present in the air aroundus. The continuous cycling of wateramong its three forms keeps the totalamount of water on the earth constanteven when the whole world is using it.Does it give you any relief?Can you recall the processes involvedin water cycle? The following activity willhelp you.Activity 16.3Fig. 16.5 shows the processes involvedin the water cycle. They are labelled bynumbers. Match these numbers withthe processes given in the jumbled form.Most towns and cities have watersupply system maintained by the civic4731. rudgon rawet2. atooniaervp3. acestoonnnid54. duclos25. tspratniaoinr66. aitfinlronit17. ntciepirtaipoFig. 16.5 Water cycle196SCIENCE