地质 (dì zhì): geology

Our university's geology department often organizes field trips; students go to mountainous areas to observe rocks and strata.

The engineers carefully studied the geological conditions here and confirmed that the soil was solid enough before deciding to start building the bridge.

The geological structure of this area is very complex; scientists spent ten years before they could draw a detailed geological map.

Due to geological changes, this ocean turned into high mountains; even now, seashell fossils can still be found on the mountains.