Which of the following process is included in Water cycle ?

Epidemic means  ________________ .

What are the methods of Conserving Water at Individual level  ?

How can we recognise the presence of pollutants in the water ?

What are the reasons of water pollution ?

What are the things added in different layers in storage tanks to separate impurities from water ?

Which of the following are correct :

(a) Sewage should not be released directly into rivers or lakes. They should be properly treated in sewage treatment plants.

(b) Harmful chemicals should not be dumped into water bodies. They should be transformed into some useful substances.

Which of the following are correct :

(a) The substances that contaminate or pollute water are called water pollutants.

(b) Waste water released from factories contains several harmful chemicals.

Which one of the following is the main cause of drought ?

Which of the following are correct :

(a) Rainwater is the purest form of natural water because it is naturally distilled Water.

(b) Surface water is the purest form of natural water because it is naturally distilled Water.

(c) Water found under the ground is actually surface water that has percolated deep into the earth.