Saturday, 26 February 2011

classification of rocks

sedimentry rocks - a rock compossed of fragmants that have been deposited compacted and cemented

igneous rocks - rocks formed from magma within the earth

metamorphic rocks - formed by the recrystallisation of other rocks in a solid state

classification of igneous rocks 

chrystal grain size - bigger longer taken to cool

silica percentage % - the more silica a mineral contains the lighter it is

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