General Geography:
* Geography: The study of the Earth's surface, including its physical features, climate, and inhabitants.
* Geologist: A scientist who studies the Earth's physical structure, composition, and history.
* Geology: The study of the Earth, its rocks, minerals, and the processes that have shaped it.
* Geophysics: The study of the physical properties and processes of the Earth, especially its internal structure.
* Geodetic: Relating to the measurement and mapping of the Earth's surface.
* Geodesy: The science of measuring and mapping the Earth's shape and size.
* Geocaching: A recreational activity in which participants use GPS devices to find hidden containers.
Specific Geographic Features:
* Geothermal: Relating to the heat within the Earth's interior.
* Geyser: A hot spring that periodically erupts, shooting water and steam into the air.
* Geomagnetic: Relating to the Earth's magnetic field.
* Geostationary: Relating to a satellite that orbits the Earth at the same rate as the Earth's rotation, so it appears stationary from a point on the Earth's surface.
* Geomorphology: The study of the Earth's surface features and how they are formed.
* Geography: The study of the Earth's surface, including its physical features, climate, and inhabitants.
Other related words:
* Geopolitics: The study of the relationship between geography and politics.
* Geoengineering: The deliberate modification of the Earth's environment to address climate change.
* Geotropism: The growth of a plant in response to gravity.
* Geocentric: Relating to the Earth as the center of the universe.
This is not an exhaustive list, but it gives you a good starting point for words containing the root "geo."