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Choose one of the geologic periods or epochs listed in Figure3.8 and find out all you can about it: How are rocks from that period identified? What are its most characteristic fossils? Where are the best samples of rocks from your chosen period found?
Recall from Chapter 1 (see Table 1) that Earth and Venus are so similar in size and overall composition that they are almost “twins.” Why did these two planets evolve so differently? Why is Earth’s atmosphere rich in oxygen and poor in carbon dioxide, whereas the reverse is true on Venus? What would happen to Earth’s oceans if Earth were a little bit closer to the Sun?
What do you think might have happened to mammals if the end-of-Cretaceous extinction had not wiped out the dinosaurs?
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