Geologic Time 1 (Time periods and extinctions)

Put this in order of smallest to largest time frame.

• Eon, Era, Periods, Epoch
• Periods, Epoch, Eon, Era,
• Epochs, Periods, Eras, Eons
• Eras, Periods, Epochs, Eons

Based on the geologic time scale, how old is the Earth?

• 4.5 billion years ago or 4,500 mya
• 3.5 billion years ago or 3,500 mya
• 9 billion years ago or 9,000 mya
• 7 billion years ago or 7,000 mya

What type of organism was the Ordovician period known for?

• Flying

• Land

• Marine

Did trilobites exist in the ordovician period?

• Yes

• No

What percentage of organisms went extinct during the ordovician-Silurian extinction

• 50

• 65

• 86

• 95

Devonian period was know as . . .

• Age of the Dog

• Age of DInosaur

• Age of the Fish

Which extinction is known as the great dying?

• Ordovician

• Late Devonian

• Permian-Trassic

What is a mass extinction?

• When all the species in a particular area on earth suddenly go extinct
• When multiple species from all over the earth suddenly go extinct 
• When one species goes extinct due to habitat changes
• When all life on earth is wiped out 

Which extinction is considered the largest mass extinction in Earth's history? Basically 96% of all species on Earth disappeared.

• Ordovician Extinction

• Devonian Extinction

• Permian Extinction

• Triassic Extinction

• Cretaceous Extinction

The Permian-Triassic extinction was caused by. . .

• Volcanic Eruption

• Meteorite hit

• Lang mass breaking up