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Geography

Classification of rocks

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Rocks found on the Earth's surface actually come from inside the Earth - so they tell us a lot about the Earth's interior. They are classified (organised) into three main groups: igneous rocks, sedimentary rocks and metamorphic rocks.

Rock types

 

Type of rockExample
Igneous rock
Lichen on granite

Granite

Sedimentary rock
Navajo Sandstone formations in Utah

Sandstone

Metamorphic rock
Slate in the Lake District

Slate

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