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In Geology , geothermal refers to heat sources within the planet. Strictly speaking, ''geo''-thermal necessarily refers to the Earth but the concept may be applied to other planets.

The planet's internal heat was originally generated during its Accretion , due to Gravitational Binding Energy , and since then additional heat has continued to be generated by the Radioactive Decay of elements such as Uranium , Thorium , and Potassium . The heat flow from the interior to the surface is only 1/20,000 as great as the energy received from the Sun .


SOURCES


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Temperature within the Earth increases with increasing depth. Highly viscous or partially molten rock at temperatures between 1,200 and 2,200°F (650 to 1,200°C) is postulated to exist everywhere beneath the Earth's surface at depths of 50 to 60 miles (80 to 100 kilometers), and the temperature at the Earth's center, nearly 4,000 miles (6,400 kilometers) deep, is estimated to be 5650 ± 600 Kelvin s [http://www.carnegieinstitution.org/news_010905.html .

  • Much of the heat is believed to be created by Decay of naturally radioactive elements. An estimated 45 to 85 percent of the heat escaping from the Earth originates from radioactive decay of elements concentrated in the crust.

  • Heat of impact and compression released during the original formation of the Earth by accretion of in-falling Meteorite s.

  • Heat released from the sinking of abundant Heavy Metals ( Iron , Nickel , Copper ) as they descended to form the Earth's core.

  • Some heat may be created by electromagnetic effects of the Magnetic Field s involved in Earth's Magnetic Field .

  • Heat generated within the Earth's Core may be in the range of 4–10 TW.



HEAT FLOW

Heat flows constantly from its sources within the Earth to the surface.
Global terrestrial heat flow is about 45 TW (1 TW = 1012 Watts).


HOT SPOTS


Geothermal heat at the surface is highly concentrated where Magma is close to the surface. This primarily occurs in Volcanic and Hotspot areas and at Spreading Ridge areas.


REFERENCES