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Why is the magma at divergent plate boundaries mostly mafic?

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Where at convergent plate boundaries it is mostly intermediate and felsic?

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  1. More divergent plate boundaries are under the ocean.

    The oceanic crust is mostly made of basalt.

    Basalt is mafic.

    More convergent plate boundaries occur on continental crust.

    Continental crust is mostly made of granite.

    Granite is felsic.

    Hope I helped. :)

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