JEREMY WALKER / SCIENCE PHOTO LIBRARY JEREMY WALKER / SCIENCE PHOTO LIBRARY
Steam warning sign. View of a steam warning sign at the Wairakei geothermal electricity generation plant. Geothermal power stations exist in areas where the Earth's crust is thin, allowing our planet's internal heat to reach the surface. The heat is used to produce steam which is carried through pipes at high speeds, driving electricity turbines. Photographed on North Island, New Zealand.
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