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Weathering and erosian causes the rocks to look like this.

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It's a volcanic glass formed as a extrusive igneous rock.

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It's formed under the Earth's surface.

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This picture of the rock was made by a weather erosion.

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Obsidian is formed extrusively. Black is the most common color, it can be used for jewelry. It is also very hard to break.

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Granite is a type of igneous rock. They are used in homes a lot of the time. You'll see them in mostly kitchens.