In geology, a rock is a naiturally occurrin solit aggregate o ane or mair meenerals or meeneraloids. For ensaumple, granite, a common rock, is a combination of the meenerals quartz, feldspar an biotite. The Yird's ooter solit layer, the lithosphere, is made o rock.
Rock haes been uised bi humankynd ootthrou history. The meenerals an metals in rocks hae been essential tae human ceevilisation.
Three major groups o rocks are defined: igneous, sedimentar, an metamorphic. The scienteefic study o rocks is cried petrology, that is an essential component o geology.
- ↑ Roberts, Dar. "Rocks and classifications". Department of Geography, University of California, Santa Barbara. Archived frae the original on 31 October 2012. Retrieved 11 November 2012. Unknown parameter
|deadurl=ignored (help) "Archived copy". Archived frae the original on 31 October 2012. Retrieved 16 Februar 2018.CS1 maint: archived copy as title (link)