a) Geological processes contributed to the formation of vents in that region.
Explanation:
The western parts of the United States are tectonically more active. This region has a subduction of a denser and heavy oceanic Pacific plate under the less dense and lighter American plate. And the release of the magma at the surface and the pressure is released through the hydro thermal vents.
Mountains plate tectonics relate to landforms. When two tectonic plates collide, they can push upwards and form mountains/mountain chains. Oceanic trenches are formed from convergent plate boundaries.
