Chapter 1

1234567891011121314
Across
  1. 4. The time when day and night are of equal length
  2. 5. A line of latitude on a map
  3. 8. The angular distance east or west of the prime meridian
  4. 10. A line of longitude
  5. 11. Shortest day of the year in the Northern Hemisphere
  6. 13. Earth's zero-degree line of longitude
  7. 14. The rigid outer layer of the Earth
Down
  1. 1. Time of the year when day and night are equal
  2. 2. The global sum of all ecosystems
  3. 3. Longest day of the year in the Northern Hemisphere
  4. 6. The layer of gases surrounding the Earth.
  5. 7. The angular distance north or south of the equator
  6. 9. All the water on Earth's surface
  7. 12. The frozen water part of the Earth system