Tectonic Plate Boundaries

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Across
  1. 2. outermost layer of the planet
  2. 4. contains most of earth's mass
  3. 6. remains of prehistoric organisms
  4. 8. tall mountain with a lot of pressure that shoots out lava
  5. 9. hot fluid or semifluid under the earth's crust
  6. 11. two plates move toward one another then collide
  7. 12. formed by solidification and deposition of sediments
  8. 15. violent shaking of the ground
  9. 16. long and high sea waves caused by earthquakes
  10. 17. scientist had the theory of continental drift
  11. 20. made of iron with small amount of iron
Down
  1. 1. a line on a rock surface
  2. 3. two plates slide against each other
  3. 5. two plates moving away from one another
  4. 7. piece of crust that floats in the mantle
  5. 10. places where the seafloor spreading takes place
  6. 13. hot molten rock erupted from a volcano
  7. 14. formed by cooling and solidification of magma
  8. 18. technical name for crust and mantle
  9. 19. formed new rocks caused by extreme pressure