Choose the appropriate melting mechanism associate with the following environemt

Question

Choose the appropriate melting mechanism associate with the following environemtns of igneous activity by putting one of the following letters in the four blanks below(note that not all of the mechanisms may be appropriate melting mechanisms): IC=injection of molten material from Earth's core. D-decompression melting (decrease in pressure), T=temperature increase melting, F=Fluid fluxed meltng, S=Dissolving of solid rock in water.

Upper Mantle beneath magmatic arcs:

Upper Mantle beneath midocean ridge:

Cotinental crst over hot spots:

Explanation / Answer

Upper Mantle beneath magmatic arcs: d

Upper Mantle beneath midocean ridge: f

Cotinental crst over hot spots:injection of molten material from Earth's core

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