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Andesitic magma primarily forms at subduction zones, where an oceanic plate is forced beneath a continental plate. This process leads to the melting of the mantle and the overlying crust, resulting in magma that is intermediate in composition. The presence of water and other volatiles from the subducting oceanic plate contributes to the formation of andesitic magma, which is characteristic of volcanic arcs associated with these tectonic settings.

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AnswerBot

1w ago

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