Name:____________________
Date:_____________________
The
History of Earth
1. How did Earth form?
2. How old is Earth?
3. How did the moon form?
4. Where did Earth’s water come from?
5. Name one reason life was impossible on early Earth.
6. Where is life suggested to have begun?
7. What was the only type of life on the planet for hundreds of
millions of years?
8. What important gas did stromatolites (cyanobacteria) release into the
atmosphere?
9. What happened during the Cambrian Explosion?
10. Describe the first land plants.
11. What was special about Tiktaalik?
12. Why were insects so big hundreds of millions of years ago?
13. Why are eggs important?
14. What was the name of the supercontinent 200,000,000 years ago?
15. What did dinosaurs evolve from?
16. What is oil made of?
17. What caused dinosaurs to go extinct?
18. How long ago did dinosaurs go extinct?
19. How did mammals survive this mass extinction?
20. On which continent did humans evolve?
21. Why did humans begin walking on two legs?
22. How did Native Americans get to America?
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