1. thermal energy
  2. nuclear energy
  3. tidal energy
  4. geothermal energy
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Option 4 : geothermal energy

Geothermal energy is the heat from the Earth. It's clean and sustainable. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma.
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