You searched for: “geothermal gradient”
geothermal gradient (s) (noun), geothermal gradients (pl)
The rate of temperature change in soil and rock from the surface to the interior of the Earth: The geothermal gradient on the average is estimated to be an increase of about +10°C per kilometer.
This entry is located in the following units: geo-, ge- + (page 20) grad-, -grade, -gred, -gree, -gress (page 3) thermo-, therm-, thermi-, -thermia, -therm, -thermal, -thermic, -thermias, -thermies, -thermous, -thermy (page 8)