Across
- 2. Islands is an island of volcanic origin.
- 4. Islands formed by eruptions of volcanoes on the ocean floor.
- 6. A volcanic mountain that is flat topped
- 8. the alternate rising and falling of the sea
- 10. valley lowland region that forms where Earth's tectonic plates move apart
- 11. plains: on the deep ocean floor. It is usually found 3,000 metres
Down
- 1. ridge formed by plate tectonics
- 3. trench long depressions on the seafloor.
- 5. slope the slope at the edge of a shelf continental shelf the area of where compared with the open ocean.
- 7. a body of water or air moving in the ocean
- 9. the force that attracts you back down to earth