Magma generation almost always involves partial melting, not complete melting of the source rock.

Name: Magma generation almost always involves partial melting, not complete melting of the source rock.
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Quizplus · Accepted Answer

Partial melting occurs when only a portion of the source rock melts, creating magma with a different composition from the original rock. Complete melting, also known as fusion, occurs when the entire source rock is melted, and this is rare in magma generation.

Magma Generation Almost Always Involves Partial Melting, Not Complete Melting