geothermal power

Miles below your feet, scorching temperatures can get hot enough to melt rock. In some places, water heated deep underground rises to the surface in hot springs and geysers. Earth's internal heat, called geothermal power, can be an important energy source. In some places, steam released from underground is used to turn turbines, creating electricity.

Image credits: main image, courtesy DOE/NREL / Pacific Gas & Electric.