DEFINITION OF ANDESITIC MAGMA

The average composition of the continental crust is andesitic,

or somewhere between the composition of basalt and rhyolite.

Laboratory experiments show that partial melting of wet

oceanic crust yields an andesitic magma. Remember that

oceanic crust is dry, but after it forms it interacts with seawater,

which fills cracks to several kilometers depth. Also, the

sediments on top of the oceanic crust are full of water, but

these are for the most part non-subductable.

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