plate tectonics

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Across
  1. 2. Ocean Ridge mountain ranges
  2. 4. Drift movement of the continents across the earth's surface
  3. 6. Boundary plates move apart
  4. 7. Core molten metal around the inner core
  5. 10. the upper layer of the earth's mantle, below the lithosphere
  6. 13. Boundary plates slip past each other
  7. 14. locating objects underwater and measuring the water's depth by sound
  8. 15. Valley pieces of earths crust come together to form a deep valley
  9. 16. coarse grains with a light color
  10. 18. Floor Spreading mid ocean ridges add new material all the time and it spreads
  11. 19. a break in earths crust where rocks go past each other
Down
  1. 1. layer of rock on earth's outer skin
  2. 2. a layer of hot rock
  3. 3. Boundary plates come together
  4. 5. a group of crust and the uppermost mantle in a single layer
  5. 8. a supercontinent
  6. 9. Ocean Trench ocean floor goes into the floor into underwater canyons
  7. 11. dark, fine, rock
  8. 12. an ancient organism that has been preserved in rock
  9. 17. Core dense ball of hard metal