A line on a map or in geology connecting points that experience the same geothermal temperature at a specific depth underground.
From Greek 'geo-' (earth) + 'isotherm' (line of equal temperature). It combines earth science terminology with thermal mapping, used in geothermal research and exploration.
Geisotherms reveal invisible heat patterns beneath our feet—they show how some locations have naturally hot groundwater just meters down, making them perfect for geothermal power plants that generate clean electricity.
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