Geologic Time

How long ago was Earth formed?

• 200 years

• 2 million years

• 4 million years

• 4.5 billion years

Choose ALL the answers for things that occurred during the Precambrian Era

• Mountains formed

• Oceans formed

• Oxygen & Ozone layer

• Plants

The Paleozoic Era contained these events...(choose all that are correct)

• Reptiles

• Lots of fish

• Land plants

• Largest extinction

The Mesozoic Era contained...(choose all correct answers)

• Reptiles

• Mammals

• Dinosaurs

• Extinction event

The Cenozoic Era contains...(choose all that are correct)

• Mammals

• Birds

• Humans

• Extinction event

Appalachian Mountains were formed in this Period...

• Ediacaran

• Cambrian

• Ordovician

• Devonian

This Period is known as the Age of Fishes

• Ediacaran

• Cambrian

• Ordovician

• Devonian

This Period contains an extinction event

• Ediacaran

• Cambrian

• Ordovician

• Devonian

This Period contains an explosion of marine life

• Ediacaran

• Cambrian

• Ordovician

• Devonian

This Period contains sea level rising and coral reefs

• Carboniferous

• Silurian

• Devonian

• Permian