7.1 Study Guide1.How old is the Earth?
2.Describe the conditions of the Earth in the beginning.
3.How did the moon form?
4.Name the 4 geological eras.
5.Which era lasted the longest?
6.In which era did life appear?
7.What was the name of the first life form?
8.What special characteristic did this life form have that improved the atmosphere?
9.Which era is known as “the age of ancient life”?
10. How long ago did plants evolve?
11. Where did our fossil fuels come from?