What is geothermal energy?

Geothermal energy is the thermal energy generated and stored in the Earth.

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Where does geothermal energy originate from?

  1. The original formation of the planet.
  2. The radioactive decay of materials like uranium deep inside the Earth.

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Outline how geothermal power stations work.

  1. In regions with lots of volcanic activity, the ground is naturally very hot.
  2. If cold water is pumped down into the ground, it will be heated by the hot rocks.
  3. We can directly use the heated water to heat our homes.
  4. Or we can allow the water to heat up so much it turns into steam.
  5. The steam can then be used to turn a turbine, which can drive a generator to produce electricity.

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Where can geothermal power stations be used?

In areas with lots of heat under the ground, such as volcanic regions.

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Give 3 advantages of geothermal power.

  1. It is renewable.
  2. It is very cheap once the power station is set up.
  3. It can be used to generate electricity, or hot water directly.

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Give 2 disadvantages of geothermal power.

  1. It can only be used in specific locations.
  2. The power stations are expensive to set up initially.

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