Here's a strange thought. When you're standing completely still on the Earth, you're moving faster than any ride. The simple truth of it is that our Earth rotates around an imaginary axis.
Rotation is like a top spinning.
Our AXIS is actually tilted to about 23.5 degrees from the vertical, but it isn't shown that way in the picture below. In your science textbook, there is more information on night and day on page 378. See if you can answer the following question after you read that page. At the Why Does the Earth Go Around website, you can read about one theory on what caused the Earth to start rotating. Remember, this is just one theory.