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.

ReferencesEedit

  1. Roberts, Dar. "Rocks and classifications". Department of Geography, University of California, Santa Barbara. Archived frae the oreeginal on 31 October 2012. Retrieved 11 November 2012. Cite uses deprecated parameter |deadurl= (help)