* It's the beginning of a sentence.
* *Geology* is the study of the Earth.
* It's part of a proper noun.
* *Department of Geology*
* *American Geological Institute*
* *The Journal of Geology*
* It's used as a formal subject title.
* *Introduction to Geology*
* *Geology 101*
You do *not* capitalize "geology" when:
* It's used as a general term.
* The students learned about the principles of *geology*.
* The professor specializes in *geology*.
* It's part of a descriptive phrase.
* The rock formations are a fascinating example of *geological* history.
* The *geological* survey revealed new insights.