Worksheet: The History of Planet Earth

In this worksheet, we will practice recognizing that many historical changes to the Earth happen over a long period of time.

Q1:

Approximately how old is Earth?

  • AFive thousand years
  • BFive million years
  • CFive billion years

Q2:

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.