Across
- 4. Spreading the usual process at work at divergent plate boundaries, leading to the creation of new ocean floor
- 5. a fracture or zone of fractures between two blocks of rock.
- 6. Boundary occurs when two tectonic plates move away from each other.
- 7. Valley an area where the earth's crust is splitting apart
- 8. long, narrow depressions on the seafloor. These chasms are the deepest parts of the ocean—and some of the deepest natural spots on Earth.
- 10. Push The upward movement of hot material causes the lithosphere to be moved upward and sideways and be split
- 13. Current heat-driven cycles that occur in the air, ocean, and mantle.
- 15. Boundary an area on Earth where two or more lithospheric plates collide
- 17. these are the areas of the ocean that are below sea level
- 18. Zone where two oceanic plates collide with one another and the denser plate goes under the less dense plate
- 19. Islands an island of volcanic origin.
- 20. tectonic Theory theory that Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since about 3.4 billion years ago.
Down
- 1. Boundary places where plates slide sideways past each other.
- 2. the study of the history of Earth’s magnetic field
- 3. Pull The downward movement of cooled material causes the plates to be dragged along with it
- 9. Drift hypothesis Wegner developed to explain the separation or movement of the continents.
- 11. Plates gigantic pieces of the Earth's crust and uppermost mantle.
- 12. The remains of an organism preserved in rock
- 14. Ridge seafloor mountain system formed by plate tectonics
- 16. supercontinent