In this worksheet, we will practice recognizing that many historical changes to the Earth happen over a long period of time.
Approximately how old is Earth?
- AFive thousand years
- BFive million years
- CFive billion years
The Appalachian Mountains shown in the image were formed 480 million years ago.
How were these mountains formed?
- AThe mountains were formed by the ocean.
- BThe mountains were formed by ice.
- CThe mountains were formed when two plates collided.