Geography terms!

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Across
  1. 3. Underground hollow often having an opening
  2. 6. A ring shaped island.
  3. 12. An area of a sea or ocean partially enclosed by land
  4. 14. A river or stream that flows into a larger river or stream
  5. 15. A land built up at a river's mouth
  6. 16. Land with tropical vegetation
  7. 18. A narrow piece of land that connects two large landmassess
  8. 19. Vast treeless plains with permafrost and small
  9. 21. A channel connecting two large bodies of water
  10. 24. Mountain formed when lava rises though the Earth's crust
Down
  1. 1. In deserts and on beaches
  2. 2. An artificial waterway used for travel
  3. 4. Lowland between moutain ranges
  4. 5. A long, wide body of water
  5. 7. Flat landmass higher than the surrounding land
  6. 8. Land surrounded by water on three sides
  7. 9. Hill that ries abruptly from surrounding ares
  8. 10. Land that rises above surrounding land
  9. 11. A large body of ice that moves across water
  10. 13. Glacial valley now filled by seawater
  11. 15. Waterless, and dry areas of land
  12. 17. A column of water and steam into the air
  13. 20. noticeably above the rest of the land
  14. 22. A body of water partially enclosed by land
  15. 23. Dense growth of trees