The primary reason magma forms at subduction zones is that the subducting plate carries a cover of sediments,water,and hydrated minerals down with it,which lowers the temperature required for the adjacent overlying mantle lithospheric rock to melt.

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Quizplus · Accepted Answer

This statement is true. The subducting plate carries materials that can lower the melting temperature of the overlying mantle rock, leading to the formation of magma at subduction zones. Water and hydrated minerals can especially have a significant impact in facilitating the process of partial melting.

The Primary Reason Magma Forms at Subduction Zones Is That