Question

(a) What is the difference between a thermal power plant and a hydro power plant?
(b) Which of the two causes serious air pollution and how?

Answer 1

(a)

Hydropower plant		Thermal power plant
1.	A hydropower plant uses flowing water to rotate turbines.	A thermal power plant uses coal, oil or gas to drive turbines.
2.	A hydropower plant does not cause air pollution.	A thermal power plant causes air pollution.

(b) A thermal power plant causes serious air pollution. This is because, in a thermal power plant, large amounts of fossil fuels are burnt every day to generate electricity.