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There is lava and magma in a volcano. When lava and magma cool it forms igneous rock.
This is an example of obsidian an igneous rock that is formed by cooling of magma.
After all the weathering and erosion happens in the river it forms sediments. When sediments are compressed it forms sedimentary rock.
An example of a sedimentary rock is Gypsum. Sediments were compressed to make it.
Metamorphic Rock is formed when existing rocks are heated or squeezed;they recrystallize and might change chemically
An example of a metamorphic rock is slate. It was heated and squeezed by existing rocks.
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