volcanoes are in some areas of the world. In the Pacific there is the Ring of Fire, which is noted for the present level of volcanic activity. In these areas, the heat that rises from deep within the earth near the surface is found. The groundwater in these areas are super hot, pressurized steam. When a hole dug in volcanic areas and reached a vapor region is a very hot gas, and water is literally erupting high into the air with such force. If you think too hard because this scene is not really surprising to know how intense and powerful, is a volcanic eruption.
The name of the natural resources, which the heat deep below the earth is called geothermal energy. In order to extract this resource, engineers need to dig very deep well, which is encased in hard and corrosion-resistant steel. There are special tubes to bring the very hot steam in geothermal power plants, where it used to turn turbines is huge electrical generators.
One of the best known professionals in the resource is its renewability.