What is geothermal heat?

Geothermal is a generic term for the heat generated by the activities of the interior of the Earth.
We show you a typical example on this site.
・Frictional heat is generated when the metal (iron, nickel, copper) is sunk into the inner core from the outer core.
・The heat produced by the electromagnetic effect of the magnetic ground.
There are a lot of other generation of geothermal heat.

For example, Geothermal power plant is generating electricity by using geothermal heat.