Geography & Earth
Intermediate

Geothermal Gradient

Temperature rise with depth into the Earth.

Formula

ΔT=GT d\Delta T = G_T \, d

Variables

G_TGradient (≈25°C/km)
dDepth

Example

2 km down ⇒ about +50 °C

Did You Know?

The deepest gold mines, around 4 km down, are so hot (~60 °C) they need massive refrigeration to keep miners alive.

geothermalearthheat