Plate tectonics crossword puzzle

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