Geologia - a greek root, ge , of the earth, and logos , a discourse on.
Geology refers to the broad subject area, which in a nutshell, is about understanding our planet.
It encompasses various disciplines such as Sedimentology , Paleontology , Mineralogy , and Petrology , to name just a few. Geology also overlaps with other subjects such as Meterology , Hydrology , Astronomy , and Oceanography , again, just to name a few. Traditional studies in geology starts with physical geology. Then a survey in historical geology. Here is a page with all of the Disciplines we cover.