Here are some examples of words with the "geo-" affix:
* Geography: the study of the earth's surface, including its physical features, climate, and human population.
* Geophysics: the study of the physical properties of the earth, including its composition, structure, and processes.
* Geochemistry: the study of the chemical composition of the earth, including its rocks, minerals, and water.
* Geothermal: relating to the heat within the earth.
* Geostationary: relating to a satellite that orbits the earth at the same speed as the earth's rotation.
