geo term challenge

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Across
  1. 5. lowland region saturated by water
  2. 7. dry areas of land, desolate, waterless and without vegetation
  3. 10. a group of closly scattered islands
  4. 12. vast treeless with persfrost and small low plants
  5. 14. a river or stream that flows into a large river or stream
  6. 16. densely overgrown land with tropical vegetation.
  7. 18. deeper part of a river or harbor
  8. 19. a peice if land surrounded by land
  9. 21. dense growth of trees and other plants covering a large area
  10. 22. an artifical waterway used for issigation and travel
Down
  1. 1. long, steep-sided glacial valley now filled by seawater
  2. 2. an area of lowland wet land
  3. 3. triangular section of land built up at a river's mouth
  4. 4. in deserts and beaches withblown sands that have formed hills
  5. 5. a narrow waterway or channel connecting two larger bodies of water
  6. 6. ring shaped island formed by coral builtup on the rim of an underwater volcano
  7. 8. steep descent of water from a height
  8. 9. hill that rises abruptly from surrounding area with sloping sides and a flat top
  9. 11. peice of land that id surrounded by water on three sides
  10. 13. part of land that rises noticeably above the rest of the land
  11. 15. a shallow pool of water at the center of an atoll
  12. 17. lowland between mountain ranges or hill ofter having a river or stream running along the bottom
  13. 18. deep, narrow valley with high steep walls
  14. 20. body of salt water surrounded almost entirly by land
  15. 22. high steep or overganging rock face