Geothermal energy is used to supply heat for industrial purposes. It may also be used to promote agricultural and aquaculture production in cold climates by heating soils, aquaculture ponds and greenhouses. In addition, ... More »

Geothermal energy is formed within the Earth. Geothermal energy is clean and stable, but it's only available near tectonic plate boundaries. Plate boundaries are where volcanic activity and earthquakes occur. More » Science Physics Thermodynamics

The geothermal gradient is the gradual warming of layers of rock relative to their distance from the Earth's surface. The average geothermal gradient is an increase of 1 degree Celsius for each 40 meters of depth. More » Science Earth Science

Geothermal energy is derived from the heat naturally emitted from the Earth's interior. This form of energy may be harnessed from underground steam and water sources and heat from solid rock and magma. It is a renewable ... More »

According to the Union of Concerned Scientists, geothermal systems use pipes driven deep into the ground to heat air, water or other fluids for the purposes of generating electricity or heating buildings. In some cases, ... More »

The primary heat source for the Earth is the radioactive decay of uranium, thorium and potassium, found in the mantle and crust. The Earth produces more heat through phase changes, such as the freezing of liquid iron in ... More »

While geothermal energy is very environmentally friendly and does not produce large quantities of pollution, only limited sites have the potential for energy generation and upfront costs are often considerable. Geotherma... More » Science Earth Science