(a) What is geothermal energy?
(b) What is the source of heat contained in geothermal energy?
(c) Explain how, geothermal energy is used to generate electricity.
(d) State two advantages of geothermal energy.
(e) State two disadvantages of geothermal energy.

(a) Geothermal energy is the heat energy obtained from hot rocks present inside the earth due to the fission of radioactive materials in it.

(b) The hot rocks present below the surface of the earth are the sources of the heat contained in geothermal energy.

(c) The extremely hot rocks present below the surface of the earth, heat the underground water and turn it into steam. As more and more steam is formed between the rocks, it gets compressed to high pressures. Therefore, a hole is drilled into the earth up to the hot rocks and a pipe is put into it so that the steam present around the rocks comes up through the pipe at high pressure, and can run the turbine of a generator. Thus, electricity is produced.

(d) Two advantages of geothermal energy are as follows:

1. It is very economical to use.

2. It does not cause any pollution.

(e) Two disadvantages of geothermal energy are as follows:

1. It is not available everywhere, rather available only in areas where there are hot rocks near the surface of the earth.

2. Deep drilling into the earth is required to obtain geothermal energy, which is technically very difficult and expensive.


Simply Easy Learning

Updated on: 10-Oct-2022


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