North American landforms

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Across
  1. 3. Elevated flat regions.
  2. 5. Pertaining to Earth's surface features.
  3. 6. Vast, flat expanses of land.
  4. 9. Where land meets the sea.
  5. 11. Elevated natural skyscrapers.
  6. 12. Geometric figure with many sides.
Down
  1. 1. 3D representation on a map.
  2. 2. Height above sea level.
  3. 4. Non-saline natural water sources.
  4. 6. Flat lands, again! (repeated in the list)
  5. 7. Elevated areas with level surface, revisited (repeated in the list).
  6. 8. Depressed areas collecting water or sediment.
  7. 10. Natural physical features on Earth's surface.