Name the substances that causes pollution.

Can high temperature kill germs? 

Suggest methods by which water can be made potable at home.

The Gangotri glacier in the Himalayas has started melting. Why?

If we drink polluted water, what is likely to happen?

Carbon dioxide in air is essential as plants use it to make food. When does it become a pollutant?

What do you mean by global warming?

What are the harmful effects of acid rain?

Write the name of some water-borne diseases.