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6. Percentage of oxygen in our atmosphere?
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?
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