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

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Partial melting occurs when only a portion of the rock melts, leaving behind some solid material, while complete melting (also known as melting to homogeneity) would result in the entire rock melting into a liquid state. Partial melting is the most common process for magma generation at depth, as it allows for the separation of minerals with different melting points and the formation of magmas with different compositions.

Magma Generation at Depth Almost Always Involves Partial Melting, Not