Geologic Time Scale Organizational Chart

3.5 billion years ago

Algae and bacteria

Within the last 500 million years

<p>About 200,000 years ago</p> Signup and view all the answers

<p>About 550 million years ago</p> Signup and view all the answers

<p>The permanent dying out of a species or a larger group of organisms</p> Signup and view all the answers

<p>The sudden disappearance of many fossil species followed by the sudden appearance of new species.</p> Signup and view all the answers

<p>A sudden, severe change in conditions on Earth.</p> Signup and view all the answers

<p>An asteroid or comet crashing into Earth.</p> Signup and view all the answers

<p>The Phanerozoic Eon, divided into three eras: Paleozoic, Mesozoic, and Cenozoic.</p> Signup and view all the answers

<p>The Cambrian explosion.</p> Signup and view all the answers

<p>Cenozoic era.</p> Signup and view all the answers