A Brief History of Geologic Time

How to humans study the geologic history of the Earth?

• study the rocks

• look into space

• study mythology

Fossils found closer to the surface are __________ than fossils found deep in the ground

• younger

• olden

The largest amount of time on the Geologic Time Scale is called 

• An Eon

• a period

• an Era

The Archean Eon was the time when what chemical entered the Earth's atmosphere?

• Oxygen

• Nitrogen

• Carbon

The sudden expansion of life in the Earth's oceans is called the 

• Cambrian explosion

• pre cambrian era

During the Paleozoic Era the super continent ___________ formed

• pangea

• super-africa

• gondwanaland

The Mesozoic Era is dominated by which life forms?

• reptiles

• fish

• mammals

What type of animals are the last lineage to the dinosaurs of the Mesozoic Era?

• birds

• crocodiles

• turtles

After the dinosaurs went extinct what types of animals took over the Earth?

• mammals

• birds

• amphibians