The sun

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Across
  1. 3. A form of energy that makes it possible to see
  2. 5. Hydrogen molecules combine to form helium molecules
  3. 6. A natural phenomenon that triggers light in polar regions.
  4. 7. Zone that transmits radiation from the core to other layers
  5. 10. A jet of dense gas from the chromosphere
  6. 13. The middle layer of the atmosphere
  7. 14. Energy transferred through a difference in temperature
  8. 15. region where energy travels outwards through convection
Down
  1. 1. The lowest layer of the atmosphere
  2. 2. the outermost layer of the atmosphere
  3. 4. Eruptions of particles and radiation
  4. 8. Power derived from reactions
  5. 9. An arc of gas that falls back to the sun
  6. 10. Dark spots on the photosphere
  7. 11. The center of the sun
  8. 12. Gas flowing out of the corona