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Across
  1. 1. long, steep-sided,, glacial valley now filled by seawater
  2. 3. a waterway used for travel
  3. 7. a river or stream that flows into a larger river or stream
  4. 9. large chunks of ice that break off of glaciers
  5. 10. an inland grassland area
  6. 12. shallow pool of water at the center of an atoll
  7. 13. piece of land that is surrounded by water on three sides
  8. 15. large chunks of ice that break off of glaciers
  9. 19. densely overgrown land with tropical vegetation
  10. 20. an are of wet land
  11. 22. flat or gently rolling lands
  12. 23. body of water partially enclosed by land with a wide outlet to the ocean
Down
  1. 1. dense growth of trees and other plants covering a large area
  2. 2. lowland region saturated by water
  3. 3. deep, narrow valley with high,steep walls
  4. 4. a group of closely scattered islands
  5. 5. vast treeless plains with permafrost
  6. 6. hill that rises abruptly from surrounding area with sloping sides
  7. 8. deepest part of a river or harbor
  8. 11. long,wide, body of water connecting larger bodies of water
  9. 14. narrow piece of land that connects two large landmasses and separates two bodies of water
  10. 16. a ring-shaped island
  11. 17. a stream of water of considerable volume
  12. 18. triangular section of land built up at a river's mouth
  13. 20. a elevated landform
  14. 21. part of land that rises noticeably above the rest of the land