Land Form Puzzle

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Across
  1. 5. A body of salt water that can be either completely or partly surrounded by land
  2. 6. A body of water that is surrounded by land on all sides
  3. 9. A place where a river water falls quickly in elevation
  4. 10. A narrow piece of water that connects two larger bodies of water
  5. 13. A large body of salt water that surrounds a continent
  6. 14. A long and narrow sea inlet with steep cliff on its sides
  7. 15. A piece of land that is bordered on three sides by water
  8. 17. A large flat area of land that is higher than the land around it
  9. 18. A raised area or mound of land
Down
  1. 1. A body of water that is part of a sea or ocean that is surrounded partly by land
  2. 2. A skinny piece of land that is surrounded by water on both sides that connects two bigger pieces of land
  3. 3. An area of water bordered by land on three sides
  4. 4. Where a mouth of a river flows into another body of water
  5. 7. A slow moving chunk of ice
  6. 8. A number of islands that are close to one another in a sea or ocean
  7. 11. A land form that extends high above the other land around it.
  8. 12. A low area between two mountains
  9. 16. A large moving body of fresh water that usually dumps into a sea or ocean
  10. 17. A large flat area of land with only small elevation changes