At a subduction zone,the overriding plate
A) is always composed of continental lithosphere.
B) is always composed of oceanic lithosphere.
C) may be composed of either oceanic or continental lithosphere.
D) is composed entirely of asthenosphere.

Question

Quizplus · Accepted Answer

The overriding plate at a subduction zone can be composed of either oceanic or continental lithosphere. It depends on the location and the type of boundary present. For example, in the Pacific Ring of Fire, where most subduction zones are located, the overriding plates are typically oceanic lithosphere. However, in zones where a continental plate is being subducted, the overriding plate would be composed of continental lithosphere. The option D is incorrect because asthenosphere is a layer of the Earth's mantle and not a plate.

At a Subduction Zone,the Overriding Plate