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In the volcano there is magma, and once it erupts it cools almost imediatly outside forming Extrusive Igneous rock like Pumice
But, inside the volcano the magma cools slower and once it does cool it forms Intrusive igneous rocks like Obsidian
Whenever the rock gets weathered it gets eroded and carried to the river or ocean and sediments are deposited in the river along with soil
Then the sediments are deposited in the bottom of the ocean they are compressed and compacted by the water pressure forming Sedimentary rock
Through more pressure and heating the Sedimentary rock turns into Metamorphic rock which looks like layers and layers of minerals
And then through even intenser heating and melting it turns back to magma!
Now, some people might think that rocks don't have different forms but they haven't seen the rock cycle which is amazing!
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