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Rock Layers (Geologic Time)

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Rock Layers (Geologic Time)
What you will learn from this videoWhat you will learn
  • Scientists study rock layers to understand Earth's history.
  • In a series of rock layers, the oldest ones are at the bottom and the newest ones are at the top.
  • Scientists organize Earth's 4.6 billion year history through the geologic time scale.
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Level 1

In a series of rock layers, where do you find the oldest layers? Explain why?

Level 2

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?

Level 3

How do scientists think the dinosaurs went extinct? Describe some of the evidence using the words: rock layers.

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