Far, far below your feet lies a source of nearly endless energy. Earth’s core is about as hot as the surface of the Sun, so hot that it melts the rocky layers above it into magma, or liquid rock. Wouldn’t it be great if we could tap into all that energy? In some places, we do!
Free Heat
Earth’s rocky crust can be miles thick. But in some spots, magma is closer to the surface. When magma pushes up through Earth’s crust, it can heat or even boil water deep underground.
