The Atmosphere

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Across
  1. 1. the lower atmosphere
  2. 4. a gas that is He on the periodic table
  3. 5. the top layer of the atmosphere
  4. 6. a gas that is N2 on the periodic table
  5. 9. something we need to breath
  6. 10. a gas that is H2 on the periodic table
  7. 12. transfer the movement of thermal energy
  8. 15. where planes fly
Down
  1. 2. t has very few atmospheric molecules
  2. 3. the transfer of heat or electrical energy through direct physical contact
  3. 7. layer absorbing the sun's ultraviolet radiation
  4. 8. the transfer of heat through the movement of fluids
  5. 11. something surrounding the earth
  6. 13. line roughly marking the altitude where traditional aircraft can no longer fly
  7. 14. Dioxide a gas that is CO2 on the periodic table