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When a tectonic plate in a subduction zone, goes underneath another tectonic plate, the magma in the Earth's core causes the plate to break up and melt. This melted rock becomes magma, and when it pushes through the Earth's crust to create a volcanic eruption, the magma cools and becomes rock. This rock is Metamorphic rock.

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Q: How metamorphosed rock is formed?
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Marble is formed when limestone is metamorphosed.


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