Mariana's crossword puzzle

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Across
  1. 7. what alfred wegener discovered
  2. 8. the technology used to discover seafloorspreading what harry hess discovered
  3. 9. alfred wegeners first piece of evidence
  4. 10. thickest and middle part of the earth
  5. 12. the thinnest and outside layer of earth
  6. 13. where the largest number of active volcanoes and destructive earthquakes take place
  7. 14. the deepest part of the ocean
  8. 15. harry hess' evidence of seafloor spreading
Down
  1. 1. when two plates move and one gets pulled beneath the other
  2. 2. middle of the ocean that disperses magma
  3. 3. discovered seafloor spreading
  4. 4. stripes along the ocean floor
  5. 5. discovered continental drift
  6. 6. super continent
  7. 7. the inner layer of earth
  8. 11. the earth shakes when two plates collide and break apart