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6. Percentage of oxygen in our atmosphere?

  • 21
  • 3
  • 90
  • 79

7. What was constantly bombing the Earth around 4.5 billion years ago?

  • Stars
  • Meteors
  • Atomic bombs
  • Fireworks

8. What is the main reason there isn't that much Carbon Dioxide in the air?

  • It would kill us
  • It can't be produced
  • There isn't enough actual carbon for it to be made
  • It is produced over many years

9. What was the Earth like around 4.5 billion years ago?

  • Violent and volcanic
  • Hot and sunny
  • Quiet and peaceful
  • Cold and damp

10. Percentage of nitrogen in our atmosphere?

  • 1
  • 78
  • 21
  • 43

11. What does the Greenhouse gas effect do to our atmosphere?

  • Makes it cleaner
  • Increases it's temperature
  • Adds more chemicals to it
  • Decreases it's temperature