Relating to the heat generated or present within the earth, especially its interior layers.
From Greek 'geo-' (earth) + 'thermikos' (of heat). This adjective is nearly synonymous with 'geothermal' but emphasizes the heat aspect more than the energy aspect.
The earth's core is incredibly hot—hotter than the surface of the sun! Geothermic gradients vary by location; some areas have a steep temperature increase that makes geothermal power plants possible, while others increase more slowly.
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