List any three human activities that you think would lead to air pollution.
Man made sources of air pollution:
(i) Use of diesel and petrol in vehicles.
(ii) Burning of coal in factories, engines and thermal power stations.
(iii) Deforestation.
What is soil erosion?
Do you know of any activity which may be polluting this water source?
Why do organisms need water?
How are clouds formed?
