geo

earth, ground

Spelled geo · ge, gaia 'earth'

Greek ge meant earth: geography maps its lands, geology studies its substance, and geothermal energy draws heat from the ground.

Words built from it

geography — the study of the earth's surface and features
geo- (earth) + graphy (writing)
geology — the study of the earth's physical structure
geo- (earth) + logy (study of)
geometry — the branch of math dealing with shapes and space
geo- (earth) + metry (measurement)
geothermal — relating to heat from within the earth
geo- (earth) + thermal (heat)
geocentric — centered on the earth
geo- (earth) + centric (centered)
geode — a rock with a hollow crystal-lined cavity
geo- (earth) + -ode (shaped like)