Igneous rocks form from cooling lava and magma. When magma cools beneath Earth's surface is called intrusive igneous rock. When lava cools on Earth's surface is called extrusive igneous rock.
Temperature and Pressure
When igneous rocks are exposed at Earth's surface, they may break down into sediments by weathering, erosion, and deposition.
Metamorphic Rock Formation
When sediments are pressed together and cemented, the sediments become sedimentary rock.
Melting and Cooling
Sedimentary rocks may become metamorphic rocks when they are under temperature and pressure changes.
Metamorphic rocks will melt and form magma under certain temperature and pressure conditions.
After the rocks are melted, they will turn into magma. And the rock cycle will start again.
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