Question

in this illustration, what does example d show?
ocean spreading
rift valley
trench
hot spot

Explanation:

A trench is a deep, narrow depression formed by subduction of tectonic plates, matching the downward-curved, sunken structure shown in example D. Ocean spreading (A) shows divergent plate movement with magma upwelling, a rift valley is a shallow, elongated land depression from divergence, and a hot spot (B/C) involves stationary magma plumes creating volcanoes, none of which match D's structure.

Answer:

trench