plate tectonics

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Across
  1. 3. Compositional layer below crust
  2. 5. What Earth's layers are arranged by
  3. 7. The center of Earth
  4. 9. There are 7 of these and they were once connected
  5. 12. When a tectonic plate is pulled beneath another
  6. 14. Earth's outer layer
  7. 17. When gravity pulls high and low dense materials
  8. 18. Landmass, or known as supercontinent
  9. 20. A large sheet of ice that is in cold areas
Down
  1. 1. Caused the solar nebula to contract
  2. 2. ideas explaining related observations in the world
  3. 4. A rock fragment which another rock surrounds
  4. 6. Bending, tilting, and breaking of rock
  5. 8. Beneath the lithosphere
  6. 10. Remains of a dead organism from a long time ago
  7. 11. A cloud of gas and dust in space
  8. 13. Earth's thin, outer shell
  9. 15. Movement on the ground when rocks break and move
  10. 16. When 2 objects hit
  11. 19. Where magma erupts