JEREMY WALKER / SCIENCE PHOTO LIBRARY JEREMY WALKER / SCIENCE PHOTO LIBRARY
Geothermal power. Steam-carrying pipes and a cooling tower (at centre left) at the Wairakei geothermal electricity generation plant. Geothermal power is only commercially viable in areas where the Earth's crust is thin, allowing our planet's internal heat to reach the surface. The steam produced is carried through these pipes at high speeds, driving electricity turbines. Photographed on North Island, New Zealand.
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