World Geography
The type of igneous rock that form from magma is a function of

the chemical composition of the magma
temperature of solidification
All of these
the rate of cooling, which influences the crystallisation process

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World Geography
The modern theory of plate tectonics states

the creation of oceanic crust and the drifting of continents
the convention currents within the earth's mantle cause the creation of new oceanic crust at the mid
that the oceanic crust is destroyed at areas where this crust type becomes subducted under the light
All of these

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