Across
- 2. earthquakes close to mid-ocean ridges are exclusively ___________ focus
- 6. mid ocean __________ which is a long mountain range rising 2000-3000m above the abyssal plain
- 9. deep long depression located down the middle of the ridge
- 10. long and narrow depressions of the seafloor found close to continental slopes or volcanic islands. Earthquakes are frequent inside them.
- 12. the oceanic lithosphere is ________ than continental lithosphere
- 13. - can be a slope with a strong gradient between continental shelf and abyssal plain but also submerged shelf
- 14. the hypothesis proposed in the 1970s that explains the theory of tectonic plates: sea floor ________________
- 15. earthquakes close to deep-sea trenches can be either shallow or _____ focus
- 16. the name of the currents that spreads the sea floor
Down
- 1. horizontal plain/gentle slope extends out from the continental slope
- 2. boats use this technology to measure distances from the surface to the sea floor
- 3. another word for seamounts which are underwater mountains with plateaus, eroded by abrasion where they reach the surface of the sea
- 4. earthquakes ar distributed not randomly but along...
- 5. the surface of the planet is broken up into ___________ plates and along these is where earthquakes and volcanoes occur
- 7. the movement of the lithospheric plates is the cause of the continental ...
- 8. volcanoes can also be __________ - smouldering materials can surface through these cracks
- 11. type of islands that are magmatic elevations that rise up above the surface of the sea
- 14. the oceanic lithosphere is destroyed by deep focus earthquakes through _____________ or sinking of the oceanic lithosphere