The cycle reaches its most transformative phase when tectonic activity pushes these rocks deep into the Earth’s crust. Here, they are subjected to intense heat and immense pressure, which causes the minerals to recrystallize and change without melting. This process creates metamorphic rocks, such as marble or slate. If these rocks are pushed even deeper into the mantle, they eventually melt back into magma, completing the loop and providing the raw material for the cycle to begin all over again.
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