Science Cross Word !!

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Across
  1. 1. Crust that is dense and made of rock that's rich in iron and magnesium
  2. 3. Boundary between tectonic plates that slide past each other horiontally
  3. 7. Chain of volcanic islands
  4. 9. Crust that has low density and made of rock that's rich in Silica
  5. 11. Super Continent that formed 300 million years ago that started breaking up 250 million years ago
  6. 13. Process which they form and break over a million years ago
  7. 14. New oceanic floor forms as magma rises to Earths surface
  8. 15. Single, large ocean when there was a super continent
  9. 16. Peice of lithosphere that has a unique geologic history
  10. 18. Fossil that lived 270 million years ago
  11. 19. Narrow valley that forms where plates separate
Down
  1. 2. Boundary between tectonic plates that are colliding
  2. 4. Undersea mountain chain that forms as magma rises and creates a new sea floor
  3. 5. Theory that explains how plates move and change shape
  4. 6. Study of alignment of magnetic rocks
  5. 8. Solid, plastic layer of the mantle
  6. 10. solid, outer layer of Earth
  7. 12. Hypothesis that states that one land mass broke up into our continents today
  8. 17. boundary between tectonic plates that move away from each other
  9. 19. Process by which Earths crust breaks apart