Life Has a History

The history of the Earth can be traced back 4.6 billion years.

Imagine putting some major events of Earth history on a timeline.

Click on the box on the timeline where you think each event should appear, starting with the appearance of the first dinosaurs.

4.6 bya 3.9 bya 600 mya 530 mya
time line
420 mya 225 mya 65 mya 130,000 ya
first fish

Earth courtesy of NASA; Cyanobacteria © J. William Schopf; Bothriolepis © UCMP; Eoraptor ©; T. rex by Dave Smith, © UCMP; Human skull clip-art.