Continental Drift Theory and Seafloor Spreading

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Across
  1. 5. Using sound waves, Marie Tharp began to map out the _____ ______.
  2. 6. The theory that the continents slowly move over time.
  3. 11. The mountain circles the globe and connects all the ___________.
  4. 12. Supercontinent made of ALL continents
  5. 13. The _____ seafloor is getting pushed out towards the continents.
  6. 14. Mountain ranges end abruptly on one ________ and pick back up on another.
  7. 16. A geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other.
  8. 17. It is the longest mountain range in the world.
  9. 19. The less-dense material _______, often forming a mountain.
Down
  1. 1. Pangea existed _______ of years ago.
  2. 2. The same _____ have been found across continents.
  3. 3. The new seafloor is being __________ at the Mid Ocean Ridge.
  4. 4. All of the continents seem to fit together like a _____.
  5. 7. A group of linked ideas intended to explain something.
  6. 8. Even the layers of ____ within these mountains match up.
  7. 9. What did they find at the bottom of the ocean?
  8. 10. Alfred ___ theory is called Continental Drift.
  9. 15. Since she was a _______, she was not allowed to go out onto boats to conduct research
  10. 18. Seafloor spreading occurs at ________ plate boundaries.