Continental Drift and Seafloor Spreading

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Across
  1. 4. device that can detect small changes in magnetic field
  2. 5. tectonic plates that are moving apart
  3. 7. study of the history of Earth's magnetic field
  4. 8. pieces of upper mantle that fit together to cover Earth's surface
  5. 10. process when the denser plate descends below the less denser plate
  6. 13. a hypothesis that Earth's continents had once been joined as a single landmass
  7. 15. vast, underwater mountain chains
  8. 17. the metal found in the ocean floor to determine polarity
  9. 18. Oceanic plates are mostly ____.
  10. 19. a fossil seed fern that resembled low shrubs
  11. 20. a mountain range resulting from continental-continental convergent boundary
Down
  1. 1. deepest trench in the world
  2. 2. the man who proposed the theory of continental drift
  3. 3. tectonic plates that are moving toward each other
  4. 6. tectonic plates move past each other
  5. 9. happens when Earth's core changes direction
  6. 11. maps generated with ___ data revealed underwater mountain chains
  7. 12. a Greek word meaning "All the Earth"
  8. 14. There are _____ major tectonic plates in the world.
  9. 16. forms from decomposition of ancient swamp plants