An imaginary line or surface within the Earth connecting points of equal temperature at a given depth or across a region.
From Greek 'geo-' (earth), 'iso-' (equal), and 'therme' (heat). Created as a technical term for geothermal research in the 20th century.
Geoisotherms reveal that Earth's interior is unevenly heated—some areas have fast-rising temperature with depth while others stay cool, which geothermal engineers use to find the best spots for heat energy.
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