Geologic Time Scale Quiz

What event marked the end of the Hadean Eon?

• Formation of continents

• Cooling of the Earth's crust

• Appearance of the first life

• Volcanic activity

Which era is often called the Age of Reptiles?

• Mesozoic Era

• Paleozoic Era

• Proterozoic Era

• Cenozoic Era

What caused the Great Dying, the most severe extinction in Earth's history?

• Climate change

• Rise of mammals

• Giant volcanic eruptions

• Asteroid impact

Which era marks the rise of mammals and the end of the Age of Reptiles?

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

• Proterozoic Era

What marked the end of the Mesozoic Era?

• Formation of Pangea

• Rise of mammals

• Cretaceous-Paleogene Extinction Event

• Cambrian explosion

Geological time is described in eras and periods. Those segments of time are based on ____________.

• whoever discovered them

• significant evolutionary events in Earth's history

• the thickness of certain rock layers

• the number of layers of rock that can be counted in 10 meters of a rock column