Measuring the Earth

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Across
  1. 3. layer in which we live in atmosphere
  2. 4. thinnest layer of the earth
  3. 6. layer of water
  4. 7. Region of measurable quantity
  5. 9. molecules that absorb harmful UV radiation
  6. 10. represents and area and shows its features
  7. 12. layer of living things
  8. 14. Lines measuring air pressure
  9. 15. lines that meet at the poles
  10. 17. Lines measuring elevation (2words)
  11. 18. layer where meteors burn up
  12. 20. Star in the sky that indicates the latitude by its altitude
  13. 21. Layer we live on top of
  14. 22. layer of gases
  15. 25. Formula for finding the change in field value over the distance
Down
  1. 1. Lines measuring temperature
  2. 2. Layer where the temperature rises significantly
  3. 5. layer above the troposphere
  4. 8. the main reference line for latitude
  5. 11. Lines that never cross
  6. 13. Lines measuring rainfall
  7. 16. lines that are parallel
  8. 19. Height above or below sea level
  9. 23. largest layer of the earth
  10. 24. main reference line for longitude(2 words)