The USA geography

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Across
  1. 3. A dense forest with high rainfall.
  2. 5. A general term for an area of land saturated with water.
  3. 7. A type of wetland dominated by grasses and reeds (like the Everglades).
  4. 8. A large, stable area of exposed ancient rock (extends from Canada into northern US states).
  5. 10. A large, flat, elevated area of land
  6. 11. A series of mountains arranged in a line.
  7. 12. An area characterized by many steep slopes.
Down
  1. 1. A wide area of land covered in tall grasses (part of the Great Plains ecosystem).
  2. 2. Land that is at, near, or below sea level.
  3. 4. A narrow strip of land connecting two larger land areas.
  4. 6. A vast, treeless Arctic region with permafrost (found in Alaska).
  5. 9. A line of connected mountains.
  6. 10. A large area of flat or gently rolling land, ideal for agriculture.
  7. 11. Relating to the land near a shoreline.