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How Subduction Causes Volcanism
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1

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What is the origin of magma in a subduction zone?
A)Magma is generated by melting in the lithosphere of the descending plate
B)Magma is generated by melting in the asthenosphere of the overriding plate
C)Magma is generated by melting in the asthenosphere of the descending plate
D)Magma is generated by melting in the lithosphere of the overriding plate
2
What is the role of water in generating magma in a subduction zone?
A)Water lowers the melting point of rock in the asthenosphere
B)Water raises the melting point of rock in the asthenosphere
C)Water causes melting in the lithosphere of the descending plate
D)Water prevents magma from forming at shallow depths in the overriding plate
E)Water prevents the lithosphere in the descending plate from melting
3
What is the origin of silica-rich magma in the Earth?
A)Silica-rich magma is derived from melting the asthenosphere of the subducting plate
B)Silica-rich magma is derived from melting the asthenosphere of the overriding plate
C)Silica-rich magma is derived from melting the lithosphere of the descending plate
D)Silica-rich magma is derived from melting oceanic crust
E)Silica-rich magma is derived from melting continental crust





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