<b>Answer question numbers 3 (a) to 3 (d) on the basis of your understanding of the following paragraph and the related studied concepts.</b>Geothermal energy is the energy produced by the heat of molten rocks formed in the deeper hot regions of the earth’s crust. This energy is harnessed to generate electricity. When water is made to flow deep underground in the rocks it returns as steam (or hot water, which is later converted to steam) to drive a turbine on an electric power generator.In India, exploration and study of geothermal fields started in 1970. The Geological Survey in India has identified 350 geothermal energy locations in the country. The most promising of these is in the Puga valley of Ladakh. The estimated potential for geothermal energy in India is about 10000 MW. There are seven geothermal provinces in India namely the Himalayas, Sohna, West coast, Cambay, Son-Narmada-Tapi; Godavari, and Mahanadi. Most power stations in India produce Alternating Current (A.C).<b>(a)</b> What are geothermal energy hot-spots?<b>(b) </b>Name two countries, other than India, where power plants based on geothermal energy are operational.<b>(c)</b> Name the phenomenon that explains the working of an electric generator.<b>(d)</b>State an important advantage of using AC over DC.