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6. What gas trapped in rocks is used to work out the temperature at the time of formation?
- Nitrogen
- Methane
- Oxygen
- Carbon
7. The Earth has how many minor plates?
8. Pangaea formed and broke up how many years ago?
9. Gondwana is what?
- Broken Pangaea
- A plate boundary
- Type of Crust
10. Gas trapped in rocks is evidence for...
- A warming climate
- A cooling climate
11. The Cambrian explosion was how many years old?
- 450 Ga
- 500 Ma
- 250 Ma
- 500 Ga
12. The beginning of the last ice age was how many years ago?
- 3.2 Ma
- 2.5 Ma
- 4.5 Ma
- 6.6 Ma
13. The Earth has how many major plates?
14. Ga is how many years ago?
- 1 hundred
- 1 billion
- 1 thousand
- 1 million
15. The extinction of dinosaurs was how many years ago?
16. Carbon dating only goes back how far?
- 100,000 years
- 50,000 yrs
- 20,000 yrs
- 10,000 yrs
17. Which crust is younger?