Geography

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Across
  1. 5. a long depression in the surface of the land that usually contains a river
  2. 6. a line of track providing a runway for trains
  3. 7. extensive tract of level open land
  4. 8. the act of setting and holding a course
  5. 9. navigational instrument for finding directions
  6. 11. a politically organized body of people under a single government
  7. 13. the cardinal compass point that is at 90 degrees
  8. 14. the cardinal compass point that is a 270 degrees
  9. 15. the cardinal compass point that is at 180 degrees
Down
  1. 1. a land mass (smaller than a continent) that is surrounded by water
  2. 2. a thoroughfare (usually including sidewalks) that is lined with buildings
  3. 3. a major road for any form of motor transport
  4. 4. study of the earth's surface
  5. 10. the ratio between the size of something and a representation of it
  6. 12. the cardinal compass point that is at 0 or 360 degrees