Across
- 3. when rocks are slowly pulled apart
- 4. is where two plates slip sideways next to eachother
- 5. the upper layer of earths mantle
- 8. an elastic wave produced by earthquakes
- 12. a process that occurs at mid ocean ridges that create new crust and moves away from the ridge
- 15. when two plates collide and one dives under the other
- 16. was the previous supper continent
- 17. center of an earthquake
- 20. when rock solidifies while lined up with earths magnetic field
- 21. the center of earth (really hot)
Down
- 1. came up with the theory of seafloor spreading
- 2. a volcanic rock
- 6. a point on earths surface above the focus of an earthquake
- 7. a system of detection of objects under water
- 9. the remains of a prehistoric plant or animal
- 10. a mountain made of cooled magma
- 11. outer part of earth consist of crust and mantle
- 13. when two plates move away from each-other
- 14. violent sacking of the ground
- 18. when rocks are squashed together
- 19. hot fluid within the earths crust