Geography cross word

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Across
  1. 3. The Thames is one; so is the Mississipi
  2. 5. As dry ____ a desert.
  3. 6. If they were bigger, we'd call them
  4. 7. Small water course.
  5. 8. Hole in the ground from which from which minerals are extracted.
  6. 9. It is cut from the ground, and it burns, but it isn't coal.
  7. 12. A wall holding back a large volume of water.
  8. 13. Numbers that help to determine the location of a point
  9. 15. Large area of fresh water.
  10. 17. Height above sea level.
  11. 18. Opposite of "dry".
  12. 19. There is a pole there.
Down
  1. 1. Very wet ground indeed.
  2. 2. A large area of trees.
  3. 4. Smaller than a town.
  4. 7. Small ocean.
  5. 8. A plan of the land.
  6. 10. The rise and fall of the ocean.
  7. 11. A pont's position on the Earth
  8. 14. Shorter synonym of "island".
  9. 16. The opposite of no. 1
  10. 18. Direction of the sunset.