Glaciers

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Across
  1. 1. internal
  2. 3. boulders
  3. 4. this type of
  4. 8. pulls down
  5. 13. ridges
  6. 14. ice sheet
  7. 17. edges move
  8. 18. put down
  9. 20. depression
  10. 21. movement of
Down
  1. 2. when glaciers
  2. 5. state
  3. 6. tear shape
  4. 7. grow
  5. 9. grooves
  6. 10. dead ahead
  7. 11. triangle
  8. 12. continent
  9. 15. cracks
  10. 16. slip when ice at the base
  11. 19. a large mass