Geothermal energy harnesses heat from within the Earth. It is a renewable resource as the Earth continuously produces heat through radioactive decay in its core. Geothermal energy can be used to generate electricity or heat buildings by extracting hot water or steam from underground. While it is a clean and constant source of energy, tapping geothermal energy deeply underground also carries earthquake risks that require more scientific understanding to mitigate potential hazards from inducing major seismic events.