Question

describing plate boundaries
which events most likely occurred at the boundary between the south american plate and the nazca plate? check all that apply.
☐ destruction of crust
☐ creation of rift valleys
☐ formation of a trench
☐ separation of two plates
☐ subduction of one plate

Explanation:

The boundary between the South American Plate (continental) and Nazca Plate (oceanic) is a convergent subduction zone. Oceanic crust is denser, so it subducts under continental crust:

1. Subduction destroys the denser oceanic crust.
2. A deep ocean trench forms where the plate dives down.
3. Subduction of one plate is the defining process here.

Rift valleys and plate separation happen at divergent boundaries, which do not apply here.

Answer:

• destruction of crust
• formation of a trench
• subduction of one plate