How fast is the Earth spinning?

How fast is the world spinning in miles per hour? In this lesson students use **unit rates** to find the speed at which the Earth rotates around the Equator, Tropic of Cancer, and Arctic Circle. Think the Earth spins at the same speed everywhere? Think again!

- Given the circumference of the Equator, find the speed of a point on the Equator
- Use the relationship between distance and time to reason about relative speeds
- Given the circumferences of the Tropic of Cancer and the Arctic Circle, calculate the speeds there
- Explain why the farther you travel away from the Equator, the more slowly you travel due to Earth's rotation

- Globe (optional)