Unit 7: Earth Systems

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Across
  1. 5. When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock
  2. 7. the outer most layer of earth
  3. 8. the middle layer of earth
  4. 9. the rock closest tot he mid-ocean ridge
  5. 12. a lava type substance found deep int he earth
  6. 15. long narrow ditch
  7. 16. a seafloor mountain system formed by plate tectonics
  8. 17. the structure of earth divided into layers
  9. 21. person who came up with seafloor spreading
  10. 25. name of the one big continent when they were all together
  11. 27. one of wegeners 4 peaces of evidence
  12. 28. the rigid outer part of the earth, consisting of the crust and upper mantle
Down
  1. 1. The rock farthest from the mid-ocean ridge
  2. 2. a current in a fluid that results from convection
  3. 3. the continents moving slowly
  4. 4. the force that moves the continents slowly causing continental drift
  5. 6. one of wegeners 4 peaces of evidence
  6. 10. a person who is studying or has expert knowledge of one or more of the natural or physical sciences
  7. 11. the inner most layer of earth
  8. 13. How old the rocks are
  9. 14. a long narrow hilltop, mountain range, or watershed
  10. 18. one of wegeners 4 peaces of evidence
  11. 19. one of wegeners 4 peaces of evidence
  12. 20. a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle
  13. 22. person who came up with the idea of continental drift.
  14. 23. nick name for Pangaea
  15. 24. a device used to calculate the ocean floor
  16. 26. the study of the continents