The correct model of the process that changes metamorphic rock to igneous rock is melting followed by cooling.
Metamorphic rock is obtained from other rocks. A metamorphic rock is a usually formed overtime. An igneous rock is formed when molten magma from the earth's crust which cools down and solidifies to form a large solid mass.
Therefore, the only way that an igneous rock can be obtained is from a melt. Therefore, the correct model of the process that changes metamorphic rock to igneous rock is melting followed by cooling.
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