It is Radioactive Decay.
No, a volcano is not a type of geothermal energy. Geothermal energy refers to heat stored beneath the Earth's surface that can be harnessed for power generation, while a volcano is a natural phenomenon where magma, gas, and ash are expelled from the Earth's crust. Volcanoes can be a potential source of geothermal energy, but they are not the same thing.
geothermal
The oldest energy known to man is Geothermal energy.This geothermal energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface. It has been used for space heating and bathing since ancient Roman times, but is now better known for generating electricity
Solar energy, wind energy, and geothermal energy are all examples of renewable energy resources.
The primary use of geothermal energy is in the agricultural industry. This type of energy is the primary source of heat in greenhouses.
renewable
renewable
geothermal plant
Geothermal
The sun is not the source of geothermal energy. Geothermal energy is generated by heat stored beneath the Earth's surface in the form of hot water, steam, and rock.
geothermal energy
Geothermal energy, using the heat from under the ground.