plate tectonics

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