Rock (geology)

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.[1]

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.


  1. 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 2012-10-31 at the Wayback Machine