Earth Vocabulary

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Across
  1. 3. protects the Earth from solar winds
  2. 4. a curved path of a celestial body around a star
  3. 6. time at which the Earth has its maximum tilt toward the sun
  4. 12. point in which the orbit of a planet is closest to the sun
  5. 14. amount of sun energy reaching the Earth at a given time and place
  6. 15. closest layer of the atmosphere to the Earth
  7. 17. this area of the atmosphere makes radio communication possible
  8. 18. satellites orbit in this layer of the atmosphere
Down
  1. 1. length of time daylight is received at any given place
  2. 2. this layer of the atmosphere absorbs solar energy. Aurora is displayed here.
  3. 5. background radiation emitted by naturally occurring radioactive compounds
  4. 7. meteors burn up in this layer of the atmosphere
  5. 8. the Ozone layer is found in this layer of the atmosphere
  6. 9. point in which the orbit of a planet is furthest from the sun
  7. 10. measurement of how high the Sun is in the sky at any given time and place
  8. 11. time at which one of the Earth's poles has its maximum tilt away from the sun
  9. 13. all water on the planet is found in this layer
  10. 16. time at which the sun crosses the celestial equator and days and nights are equal in length