which type of zone is located at a deep - ocean trench?\nconvergent\ndivergent\nsubduction\ntransform

Brief Explanations:

Deep - ocean trenches are formed at subduction zones where one tectonic plate is forced beneath another. Convergent boundaries can have subduction zones but subduction is the more specific term for the zone at the trench. Divergent boundaries create rifts and transform boundaries involve sliding of plates.

Answer:

subduction