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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 22.1°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.
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Geothermal
gigawatt (GW)
Energy; Geothermal
An electrical unit of power that is equal to 1000 megawatts or one billion watts.
granite
Energy; Geothermal
A hard, coarse grained, rock that is often used in building materials. Granite is an intrusive, igneous rock ie. it forms from magma underground. Like most other rocks, granite contains low levels of ...
heat pump
Energy; Geothermal
By circulating water underground, a geothermal heat pump uses the relatively constant heat of the earth to alter the temperature of the circulated water. This water can then be used to heat or cool ...
hot dry rock (HDR)
Energy; Geothermal
Subsurface geologic formations of very high heat content that are found a few kilometres below the ground.
hydrothermal
Energy; Geothermal
Describes geothermal systems with naturally occurring groundwater that has been heated by either heat-producing rocks or nearby volcanic activity.
impermeable
Energy; Geothermal
A substance that cannot be penetrated. A rock or material that stops the movement of water or other liquids through it.
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