Geothermal mapping, Iceland. Map of iceland, showing the temperature at a depth of two kilometres below the surface. This shows areas with a high potential for boreholes to be drilled to those depths, to extract geothermal power. The colour-coded key shows temperatures in degrees Celsius: less than 10 (blue), 90-100 (yellow), 100-120 (orange), 120-150 (red) and 150-200 (brown).
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