Energy from Earth's core

"Beneath Earth's surface is a boundless source of energy--geothermal energy. Heated by our planet's red-hot core, hot water and hot rock below the ground on which we walk already provides energy in many parts of the world, from Alaska to Hawaii. Discover the different forms geothermal energy, how people are harnessing and using this rich supply, and how it could be an important part of our energy future."--