CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Geothermal power in the USA. Cutaway artwork showing the drilling of a borehole in the USA to a depth of 6 kilometres to extract geothermal power. The scale at right shows the depth in increments of one kilometre. In this area, there is little groundwater to be heated by the magma (molten rock, orange). Instead, water is pumped downwards through another borehole (left), allowing the main borehole (right) to extract the energy of the heated water.
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