If a deep ocean trench is located adjacent to a continent, active volcanoes would likely be found on the landward side of the trench, forming a volcanic arc parallel to the trench.

Here's why:

* Subduction Zones: Deep ocean trenches are formed at subduction zones, where one tectonic plate (the oceanic plate) dives beneath another (the continental plate).

* Magma Generation: As the oceanic plate descends, it melts due to the heat and pressure. This melted rock (magma) rises to the surface, often along the edge of the overriding continental plate.

* Volcanic Arcs: This rising magma erupts through the Earth's crust, forming chains of volcanoes known as volcanic arcs. These arcs are typically parallel to the trench and located on the landward side.

Example:

The Andes Mountains in South America are a classic example of a volcanic arc formed above a subduction zone. The Nazca Plate is subducting beneath the South American Plate, creating the Peru-Chile Trench and the Andes Mountains, which are dotted with active volcanoes.