Science

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Across
  1. 1. deep underwater canyons like what the grand canyon was like long long ago.
  2. 6. where earth's crust diverge on land
  3. 7. a theory that what made in the mid-1960s
  4. 10. what it's called when plates move apart or diverge
  5. 13. breaks in earth's crust where rocks have slipped past each other
  6. 14. what it's called when plates come together or converge
  7. 17. of rock that builds earth's outer skin
  8. 18. dense ball of solid metal
  9. 20. mountain ranges that ran along the middle of some ocean floors.
Down
  1. 2. adding new material to to the ocean floor.
  2. 3. device that uses sound waves to measure distance to an object.
  3. 4. earth's solid outer shell like an egg shell
  4. 5. scientists idea that continents slowly moved over earth's surface.
  5. 8. when the ocean floor sinks beneath a deep-ocean trench
  6. 9. when plates slip past each other
  7. 11. german scientist
  8. 12. layer of molten metal surrounding the inner core
  9. 15. layer of hot rock
  10. 16. 300 million year old supercontinent.
  11. 19. old rock