Magnetic differentiation is the process by which a single homogeneous magma is able to produce two or more than two of different composition,which ultimately forms diverse rock types.
That process would have to be one that causes magma composition to change.magnetic diffraction can occur by the chemical reaction between the magma and the first crystals to solidify from it.
Igneous rock form when magma cools and crystalline on the surface of the earth or inside the earth crust. Inside the crust all the magma is develops underground in the lower crust or upper mantle. Magma undergo bulk chemical change during the partial melting process, cooling emplacement , or eruption.
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