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What is the source of geothermal energy?

Answer 1

Heat from the Earth.

There are three main sources of heat on Earth:1. Thermal energy from Earth's formation;2. Radiation from radioactive rocks heats rocks; and3. The intense pressure of the rock layers above Earth actually generates heat.

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Answer 2

Jose Arroyo

The source of geothermal energy is the heat that emanates from the Earth's core. This heat is produced by the radioactive decay of minerals in the Earth's crust and mantle, as well as residual heat from the planet's formation.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.