1) which of the following causes water pollution? a) smoke b) chlorine c) oil spils d) All of the above 2) __________ is caused by drinking dirty water a) malaria b) dengu c) jaundice d) both a and b 3) identify the image a) water pollution b) water treatment plant c) water filter d) none of these 4) identify the image a) boiling b) water bodies c) both a and b d) water filter 5) boiling water kills a) germs b) flies c) insect d) none of these 6) _____% of earth water can be used for drinking a) 0.05 b) .5 c) 0.5 d) both a and b 7) 3/4 th of the earth is a) air b) land c) atmosphere d) water

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