Oops! It looks like your security settings are blocking this video 🙁
If you are on a school computer or network, ask your tech person to whitelist these URLs:
*.wisita.com, fast.wistia.com, fast.wistia.net, embedwistia-a.akamaihd.net
Sometimes a simple refresh solves this issue. If you need further help, contact us.
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 the bottom and the newest one are at the top.
- Scientists organize Earth's 4.6 billion year history through the geologic time scale.
Explore More Science Topics
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.