Question

the diagram above shows an oceanic - continental subduction zone. which of the following accurately describes an effect of subduction in this setting?
a. the continental plate plunges below the oceanic plate and is recycled into the earths interior.
b. magma rises upward through the overriding continental plate.
c. a volcanic arc forms on the subducting oceanic plate.
d. a trench forms in the asthenosphere below the continental plate.

Explanation:

Step1: Analyze subduction direction

The diagram shows the oceanic plate (denser) subducting below the continental plate, not the reverse. So A is wrong.

Step2: Check magma movement

Subduction of oceanic crust causes melting; magma rises through the overriding continental plate. This matches B.

Step3: Verify volcanic arc location

The diagram labels a volcanic arc on the continental plate (overriding), not the subducting oceanic plate. So C is wrong.

Step4: Locate the trench

The trench is on the ocean floor (lithosphere), not in the asthenosphere. So D is wrong.

Answer:

B. Magma rises upward through the overriding continental plate.