• 1. 
    Fire is a significant source of carbon dioxide in the atmosphere.

  • TRUE
  • FALSE
  • 2. 
    Earth’s atmosphere extends about 50 miles out into space.

  • TRUE
  • FALSE
  • 3. 
    The troposphere is above the stratosphere in Earth’s atmosphere.

  • TRUE
  • FALSE
  • 4. 
    The amount of carbon dioxide in the atmosphere has grown recently.

  • TRUE
  • FALSE
  • 5. 
    Space travel begins outside Earth’s atmosphere.

  • TRUE
  • FALSE
  • 6. 
    Greenhouse gases deflect radiation.

  • TRUE
  • FALSE
  • 7. 
    Earth is the only planet with an atmosphere.

  • TRUE
  • FALSE
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