Which of the following is commonly expected near a "textbook" subduction zone (that is, near a subduction zonethat is so perfect and free of confusing complications that you would use it in a textbook to teach students)?

(A) Pull-apart earthquakes and faults.
(B) Basaltic mid-ocean-ridge-type volcanoes.
(C) Piled-up mud and other things scraped off the descending slab.
(D) Slide-past (or transform, with horizontal but not vertical movement) earthquakes and faults.
(E) Basaltic hot-spot-type volcanoes.

Options (C) and (E)

Explanation:

The given question is related to the subduction zone which forms in a convergent type of plate boundary.

In a convergent plate boundary, when two plates collide, it results in the formation of a subduction zone, where the denser plate sinks below the lighter one. As the heavier plate descends, a significant amount of materials (sediments) are scraped off, and eventually deposited at the edge of the over-riding plate, which is commonly known as the accretionary prism. In addition to this, when the down-going plate reaches the layer of the asthenosphere, the rocks melt and mix with the magma. The magma slowly again rises upwards towards the surface in the over-riding plate, giving rise to the formation of volcanoes which are basaltic in nature. For example, Mount Fuji is a basaltic strato-volcano.

Thus, the correct answers are options  (C) and (E).

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