Plate tectonics

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Across
  1. 2. / A trench is a ? in the ocean
  2. 4. Wegener/ Scientist who proposed of the theory of the continental drift
  3. 6. / 2 plates come together
  4. 11. happens in the asthenosphere
  5. 12. / When two plates go away from each other
  6. 13. boundaries / three types divergent,convergent and transform
  7. 14. / Biggest plate out of the 7 major plates
  8. 18. / 2 plates slide past each other
  9. 19. / happens in trenches
  10. 20. there are two types of ? one is oceanic
Down
  1. 1. ocean ridge / seafloor spreading takes place
  2. 3. Currents / the power of moving the continents
  3. 5. Plates are located here
  4. 7. crust / One of the two crusts
  5. 8. /One super continent
  6. 9. Wegener's theory was first ____
  7. 10. Drift/ Theory of the continents moving
  8. 15. spreading / at the mid-ocean ridge a new sea floor is built
  9. 16. / Recent discovery of the plate tectonics happened in the mid ?
  10. 17. tectonics / causes earthquakes