Across
- 3. trench steep depressions in the deepest parts of the ocean
- 5. ocean ridge seafloor mountain system formed by plate tectonics
- 6. plain a flat region of the ocean floor
Down
- 1. rise a wide, gentle incline from a deep ocean plain
- 2. shelf submerged under an area
- 4. slop is usually a steep slope from a continental shelf to the ocean floor