Geothermal
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How is geothermal formed and how is it used
It is generated from the earths core and the sun. Made mostly from the decay of naturally radioactive materials such as uranium and potassium. It is used by heating and cooling,
Disadvantages
Although there are many advantages of using geothermal energy there are also some disadvantages like the fact that you can only use geothermal energy can only be used in one particular region, and it can't be transported very far.
Geothermal energy is a renewable energy source
This is because the Earth's core will continue to produce heat, and the energy doesn't take millions of years to form.