Plate tectonics crossword puzzle

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Across
  1. 3. the name of a single landmass that broke up around 200-300 million years ago
  2. 5. The layer of earth where convection currents take place
  3. 7. Two plates separating
  4. 9. The innermost/ densest layer of earth
  5. 10. a system that determines the distance of an object underwater by recording the echoes of sound waves
  6. 13. a process in which new land is created and the old land moves further away from where it was created
  7. 15. a break in the earths lithosphere along which the rocks move along
  8. 16. a vibration that travels through the earth carrying the energy released by an earthquake
  9. 18. Two plates sliding past each other
  10. 19. a extensive break in the middle of the ocean which shows how plates are moving
Down
  1. 1. a liquid-like solid layer in the mantle that the plates float on
  2. 2. Two plates colliding
  3. 4. a deep valley along the ocean floor where the oceanic crust sinks into the mantle
  4. 6. the upper most layer of the mantle
  5. 8. a deep valley that is formed when to plates move apart
  6. 11. Alfred Wegener created this idea
  7. 12. Large chunks of land that float on the mantle
  8. 14. The Scientist that created the plate Tectonics theory
  9. 16. process by which a denser crust sinks down into the mantle
  10. 17. The outermost/ least dense layer of earth