Why is geothermal energy considered a renewable resource?

The heat of the Earth self-replenishes and so is considered renewable.
Geothermal energy refers to energy that is captured from the Earth’s crust ( geo referring to Earth and thermal referring to heat). This can be done a few ways:
Because the heat of the Earth self-replenishes it is considered renewable.
http://www.renewableenergyworld.com/geothermal-energy/tech.html

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