“M” writes
Metamorphic rock is formed by existing rock getting changed by heat and/or pressure.
Metamorphic rock may have small crystals, some have layers, like marble and slate.
Metamorphic means ‘changed form’
Examples (as found in CGP KS3 Geography and CGP KS3 Science)
sandstone becomes quartzite
limestone becomes marble
granite becomes gneiss
clays become slate
When we were travelling in Switzerland we took a photo of metamorphosed sedimentary rock, which showed layers of sedimentary rock that had been pushed up into curved folds:
For more info on rock types, click on the links below
http://library.thinkquest.org/J002289/meta.html
http://www.open2.net/sciencetechnologynature/worldaroundus/tooklit/rocktypes2.html
