Geothermal

Geothermal

Geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth's interior. Away from tectonic plate boundaries, it is about 25°C per km of depth (1°F per 70 feet of depth) in most of the world. Strictly speaking, geo-thermal necessarily refers to the Earth but the concept may be applied to other planets. The Earth's internal heat comes from a combination of residual heat from planetary accretion (about 20%) and heat produced through radioactive decay (80%). The major heat-producing isotopes in the Earth are potassium-40, uranium-238, uranium-235, and thorium-232. At the center of the planet, the temperature may be up to 7,000 K and the pressure could reach 360 GPa. Because much of the heat is provided by radioactive decay, scientists believe that early in Earth history, before isotopes with short half-lives had been depleted, Earth's heat production would have been much higher. Heat production was twice that of present-day at approximately 3 billion years ago, resulting in larger temperature gradients within the Earth, larger rates of mantle convection and plate tectonics, allowing the production of igneous rocks such as komatiites that are not formed anymore today.

Read more about Geothermal:  Heat Sources, Heat Flow, Direct Application, Variations

Other articles related to "geothermal":

South Volcanic Zone - Geothermal Activity
... The Andean Volcanic Belt represents a large geothermal province, with numerous hot springs, solfataras and geysers associated with its volcanoes ... The geothermal exploration in the Andes was pioneered in Chile in the 1960s, although the site of El Tatio was invistigated already in the 1920s ... to neighboring Central America, the Andean region is poorly explored and exploited for geothermal resources ...
Geothermal - Variations
... The geothermal gradient varies with location and is typically measured by determining the bottom open-hole temperature after borehole drilling ... on the Earth's surface, M the thermal conductivity of the rocks there, and g the measured geothermal gradient ... Hence, using the global average geothermal conducting gradient of 0.02 K/m we get that q = 0.06 W/m² ...
Renewable Energy In Colombia - Geothermal
... today IPSE, and the Latin American Energy Organization have identified three areas with geothermal power potential Azufral, in Nariño Department ... The potential of the main sources of geothermal power in Colombia is summarized below Area Department Potential Chiles-Cerro Negro Nariño High ...
Climate Change In Idaho - Action To Address Climate Change - Renewable Energy and Propulsion - Geothermal
... For more information on geothermal resources, including resource maps, visit GeoPowering the West ...
Low-carbon Power - Examples of Low Carbon Technology - Geothermal Power
... Geothermal electricity is electricity generated from geothermal energy ... Geothermal electricity generation is currently used in 24 countries while geothermal heating is in use in 70 countries ... Estimates of the electricity generating potential of geothermal energy vary from 35 to 2000 GW ...