Subducted slabs completely melt in the mantle and mix with the surrounding mantle.

Name: Subducted slabs completely melt in the mantle and mix with the surrounding mantle.
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Quizplus · Accepted Answer

Subducted slabs do not completely melt in the mantle; instead, they partially melt and can trigger magma generation, but significant portions remain solid and can descend deep into the mantle, contributing to mantle convection and geochemical heterogeneity.

Subducted Slabs Completely Melt in the Mantle and Mix with the Surrounding