Grand Canyon Geology is the scientific study of the solid Earth. Geologist are the people who study geology. They often study the rocks Earth is made up out of and the peocess in which they change. Geology helps to determine how old the Earth is. Retrieved from "https://sciences.fandom.com/wiki/Geology?oldid=4768" Categories: Geology Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.