Answer:
Deep Ocean Trenches
Explanation:
1. Trenches are present in the proximity of volcanic island arcs.
2. Trenches are found in deep ocean floor. These are structures having depth of more than 600 m. The volcanic island arcs are found almost 200 m away from the trenches.
3. Abyssal Plains are flat regions having sediment blanket over them. These are located nearby the margins of the oceanic basins.
4. Coral Atolls are carol reefs having ring shape.
5. Rift Zone is the region where the volcanic area has cracks or rifts.
