Relating to the measurement and mapping of Earth's internal heat distribution, or describing areas with significant geothermal activity.
From 'geisotherm' with the adjective suffix '-al'. It combines earth science terminology to describe thermal properties of the Earth's interior and subsurface.
Iceland sits on geisothermal hotspots so intense that Icelanders literally pipe hot water from the ground into buildings and outdoor pools—a renewable energy system that's worked for decades.
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