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Types of rocks - Coggle Diagram
Types of rocks
Sedimentary rocks
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How they are formed
As explained in 'How igneous rocks are related to sedimentary rocks', The sediments from broken rocks get deposited in a new place which is usually an ocean or sea. Then, they settle down and pile up on top of each other and the bottom layers start becoming denser because of the weight of the water and other layers on top of them. The upper layers also get compacted because of the weight of the water on them. When, after many years, the sediments become solid rock again, they are Sedimentary rocks.
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Igneous rocks
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Intrusive rocks
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How they are formed
Intrusive igneous rocks are rocks that form under the Earth's crust when magma cools down and solidifies.
Extrusive rocks
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Extrusive igneous rocks are formed when volcanoes spew magma out that solidifies on the Earth's crust.
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Metamorphic rocks
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How they are formed
Contact metamorphism
In contact metamorphism, magma from volcanoes flows out and makes contact with sedimentary rocks which, because of the extreme heat, transform into a metamorphic rock.
Regional metamorphism
In regional metamorphism, two tectonic plates collide and create a crack in the ground in which there is a lot of pressure so if any sedimentary rock falls into it, it will transform into a metamorphic rock due to the extreme pressure.
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