Geo terms matching

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Across
  1. 3. an inland grass area
  2. 5. shallow pool of water at the center of a atoll
  3. 7. an artificial waterway used for irrigated travel
  4. 8. hill that rises abruptly from surrounding area with sloping sides and a flat top
  5. 12. a group of close scattered islands
  6. 15. a ring shaped island from coral build up on the rim of a volcano
  7. 16. deeper part of a river or harbor
  8. 18. triangular section of land built up at a rivers mouth
  9. 19. an area of low-lying, wet land
  10. 20. natural hot spring that emits a column of water and steam in the air
  11. 21. bodies of water, larger than land
Down
  1. 1. flat land masses higher than the surrounding land with at least one steep side
  2. 2. a narrow waterway or channel connecting two larger bodies of water
  3. 3. a piece of land that Is surrounded by land on three sides
  4. 4. flat or gently rolling lands
  5. 6. vast treeless plains with permafrost and small, low plants
  6. 9. flat topped elevated area
  7. 10. area of barren land with roughly eroded ridges and peaks
  8. 11. mountains formed when lava rises through earth's crust
  9. 13. narrow piece of land that connects two land masses and separates two bodies of water
  10. 14. large chunks of ice that breaks of from glaciers
  11. 17. long, steep sided, glacial valley now filled by sea water