The Sun

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Across
  1. 5. the sun does not have a ________ surface
  2. 8. earth protected by atmosphere and _____
  3. 9. Gas that makes up 1/4 of the sun's mass
  4. 10. The inner layer of the sun's atmosphere
  5. 12. Explosions from the chromosphere
  6. 15. The center of the sun
  7. 17. Reddish loops of gas that arc to sunspots
Down
  1. 1. No _______ between the layers of the sun
  2. 2. The sun's energy is caused by _____ _____
  3. 3. The sun is not solid. It is a ball of _____ gas
  4. 4. Nuclear fusion occurs under high___& pressure
  5. 6. Gas that makes up three fourths of the sun mass
  6. 7. layer of sun between photosphere and Corona
  7. 11. Electrically charged particles that stream out
  8. 13. The interior of the is like a giant ______
  9. 14. Dark areas of the sun's surface
  10. 16. The middle layer of the sun's atmosphere
  11. 17. Sunspots usually occur in _________