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- Scientists study rock layers to understand Earth's history.
- In a series of rock layers, the oldest ones are the bottom and the newest one are at the top.
- Scientists organize Earth's 4.6 billion year history through the geologic time scale.
In a series of rock layers, where do you find the oldest layers? Explain why?
If you see many fossils of an animal in rock layers and then a few layers above they are all gone, what does that tell you?
How do scientists think the dinosaurs went extinct? Describe some of the evidence using the words: rock layers.
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