Why do hot springs exist?
Show answer & explanation
Answer: Geothermal heat warms groundwater
Underground fires heat water — Wrong. There are no underground fires. Hot springs get heat from Earth's geothermal gradient—temperature increases with depth.
Geothermal heat warms groundwater ✓ — Correct! Deep underground, Earth's temperature increases ~25°C per kilometer. Groundwater seeping down gets heated by hot rocks (often near volcanic activity or tectonic activity). The heated water rises back to the surface through cracks and faults, emerging as hot springs. Some reach boiling temperature!
Chemical reactions boil water — Wrong. Some hot springs have chemical reactions (minerals dissolving), but the primary heat source is geothermal—Earth's internal heat warming groundwater.
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