CLAUS LUNAU / SCIENCE PHOTO LIBRARY CLAUS LUNAU / SCIENCE PHOTO LIBRARY
Geothermal power in Iceland. Cutaway artwork showing the drilling of a borehole in Iceland to a depth of 5 kilometres to extract geothermal power. The scale at right shows the depth in increments of one kilometre. At this depth, a layer of water has formed from rainwater (upper right) draining through the ground (blue arrows). The water is heated by magma (molten rock, orange), and the borehole enables the energy of the heated water to be extracted. This is the Iceland Deep Drilling Project.
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