sedimentary layers structural geology study positions rock units deformation many cases geologists also study modern soils rivers landscapes glaciers investigate past current life biogeochemical pathways use geophysical methods investigate subsurface sub specialities geology may distinguish '''endogenous''' '''exogenous''' geology field methods typical usgs field mapping camp today handheld computers gps geographic information systems software often used geological field work digital geological mapping petrified log petrified forest national park arizona usa geological field work varies depending
Social science Geography Physical geography Geology