(a) Geothermal Energy:

Geothermal Energy is the heat energy from hot rocks present inside the earth. The heat can be used as a source of energy to produce electricity.

At some places, rocks at some depth close to earth’s surface are very hot. These are known as hot spots and are sources of geothermal energy.

The hot rocks heat the underground water to produce steam. A hole is dug and the pipe is put in it. The steam present around the rocks come up at high pressure, which turns the turbine of the generator to produce electricity.

(b) Advantages of Wind Energy:

(a) It does not cause any pollution

(b) The wind energy is a renewable source of energy and never gets exhausted

Increased use of wind energy to generate electricity helps in conserving fossil fuels like coal, petroleum and natural gas.