Using the timeline your group created answer the following questions.
1. How much older is Earth than you?
2. How would you help a kindergarten student understand the age of the Earth?
3. How do scientists determine when an eon, era, or period begins and ends?
4. When did the greatest extinction event occur on Earth? How?
5. What triggered the beginning of the Cenozoic era?
6. How did photosynthesis change Earth’s atmosphere? Why was this one of the most significant events in Earth’s history?
7. What evolutionary adaptation allowed for life on land?
8. In your opinion, what was the most crucial geological or biological event for the evolution of humans?
9. What evidence have scientists used to answer these kinds of questions?
10. Why is it important for scientists (and us) to study the history of the Earth?
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