Published On: Tue, Jun 29th, 2010

Rocks- Classification of rocks

Rocks
Three main groups of rocks: Igneous, sedimentary and metamorphic.

Classification of rocks
Igneous rocks: granite.
Sedimentary rocks: sandstone; limestone; shale; coal.
Metamorphic rocks: marble.
Phyllite: This rock is formed by deposits of animal shells and skeletons.

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