Geothermal energy originates far below the Earth's crust in a layer called the mantle. The mantle is made of molten rock called magma hot. In recent years, water seeps into the earth's crust to form pools and underground rivers. In parts where the magma wells up in the top, it warms the water. This hot water then the wells of the land, whether in the form of steam or hot plain water. Geothermal energy in this hot water can be utilized directly for heating or harnessed to produce electricity.