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What are some common uses for igneous rocks?

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The most common igneous rock found at the earth’s surface is granite. It is widely used in construction. Granite occurs in a range of vibrant colours. Pumice is a light coloured and lightweight igneous rock ejected from a volcano at very high heat and pressure. Crushed pumice is often added to soaps to clean and exfoliate.

One example of extrusive igneous rock – igneous rock that cools above the surface of the ground rather than beneath – is obsidian. Obsidian is smooth like glass and usually jet black, although it can be seen in a variety of colors and used for decoration.


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