Are you smarter than the terms

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Across
  1. 2. sandy, pebbly or rocky shore of a body of water
  2. 5. steep descent of water from a height
  3. 8. deep narrow valley with steep walls
  4. 9. one of the large masses on earth
  5. 10. piece of land that is surrounded by water on three sides
  6. 12. densely overgrown vegetation
  7. 14. range a row or chains of mountains
  8. 16. a stream of water
  9. 19. flat-topped elevated landform
  10. 20. large body of ice that moves across the earth
  11. 22. small pool of water at the center of an atoll
  12. 24. ring shaped island
Down
  1. 1. flat or gently rolling land
  2. 3. an artificial waterway used for irrigation
  3. 4. an inland grassland area
  4. 6. treeless plains with permafrost
  5. 7. a group of closely spreader islands
  6. 11. larger than a bay
  7. 13. Narrow piece of land that connects two large land masses
  8. 14. an area of low lying wet land
  9. 15. large chunks of ice that breaks off
  10. 17. dry land with no vegetation
  11. 18. lava rises through earth's crust
  12. 21. high steep or overhanging rock face
  13. 23. large body of salt water