Geography crossword

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Across
  1. 6. A high area of land
  2. 9. The most important line of longitude
  3. 11. The units used to measure line of latitude and longitude
  4. 13. Low land with higher land either side
  5. 14. Imaginary line running around the Earth
Down
  1. 1. A sphere with a map of the world printed on
  2. 2. How high above sea level something is; often measured in metres
  3. 3. An area of flat, low land
  4. 4. Map with shows height above sea level
  5. 5. A natural feature formed on the Earth's surface
  6. 7. An imaginary line 23.5 degrees north of the equator
  7. 8. The point from which land is measured
  8. 10. The most northerly point on Earth
  9. 12. Equally spaces lines going across and up and down