If you took a class that focused on the study of earth what root word would most likely see in course name?

The root word you'd most likely see in a course name focusing on the study of Earth is "geo-".

This comes from the Greek word "ge" meaning "earth".

Here are some examples:

* Geology: The study of the Earth's physical structure and substance.

* Geography: The study of the Earth's surface, including its physical features, climate, and human populations.

* Geophysics: The study of the Earth's physical properties and processes.

* Geochemistry: The study of the Earth's chemical composition and processes.