Geothermal resources refer to the heat stored beneath the Earth's surface. This heat originates from the planet's formation and the decay of radioactive materials. It can be found in various forms, such as hot water, steam, or hot rocks, and is often harnessed for energy production, heating, and other applications. Geothermal energy is considered a renewable resource because it is continuously replenished by the Earth's natural processes. Countries like Iceland and the United States utilize geothermal resources for electricity generation and direct heating, contributing to a more sustainable energy future.