Correct Answer - Option 2 : Geo-thermal energy
Explanation:
Geothermal energy is the heat that comes from the sub-surface of the earth. It is contained in the rocks and fluids beneath the earth’s crust and can be found as far down to the earth’s hot molten rock, magma.
- To produce power from geothermal energy, wells are dug a mile deep into underground reservoirs to access the steam and hot water there, which can then be used to drive turbines connected to electricity generators.
Advantages and Disadvantages
- There are many advantages of geothermal energy. It can be extracted without burning a fossil fuel such as coal, gas, or oil. Geothermal fields produce only about one-sixth of the carbon dioxide that a relatively clean natural-gas-fueled power plant produces.
- Unlike solar and wind energy, geothermal energy is always available, 365 days a year. It’s also relatively inexpensive; savings from direct use can be as much as 80 per cent over fossil fuels.
- But it has some environmental problems. The main concern is the release of hydrogen sulfide, a gas that smells like rotten egg at low concentrations. Another concern is the disposal of some geothermal fluids, which may contain low levels of toxic materials. Although geothermal sites are capable of providing heat for many decades, eventually specific locations may cool down.
Solar Energy
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Solar energy is obtained from the Sun.
- Solar energy is Non-conventional sources and renewable sources of energy.
- As they are prone to deterioration over time and aren’t completely weather-safe are some drawbacks to Solar Energy.
Nuclear Energy:
- The energy obtainable from the nucleus of an atom is called nuclear energy or atomic energy. There are two distinct ways of obtaining nuclear energy:
- Nuclear fission
- Nuclear fusion
- Nuclear energy is measured in terms of an electron volt (eV) where 1 eV = 1.6 x 10-19 J.
- A bigger unit to measure nuclear energy is called mega electron volt (MeV).
⇒ 1 MeV = 106 eV = 1.6 × 10-13 J
