Question

select all the correct answers. two tectonic plates of different densities collide. which of the following could form at the plate boundary? island mid-ocean ridge rift valley trench volcano

Explanation:

1. Island: When an oceanic plate (denser) subducts under a continental plate (less dense), volcanic activity from the subduction can form islands (e.g., island arcs).
2. Mid - ocean ridge: Forms at divergent boundaries (plates moving apart), not convergent (colliding) with different densities, so incorrect.
3. Rift valley: Forms at divergent boundaries (plates pulling apart), not convergent, so incorrect.
4. Trench: At a convergent boundary with different densities (oceanic - continental or oceanic - oceanic subduction), a trench forms as the denser plate subducts.
5. Volcano: Subduction at a convergent boundary (different densities) can cause melting of the subducting plate and overlying mantle, leading to volcanic activity (e.g., Andes or island arcs have volcanoes).

Answer:

A. island, D. trench, E. volcano