3.8: Geologic Time Scale

Multiple Choice

Which of the following is NOT a division of geologic time?

• eons

• periods

• generations

• epochs

Multiple Choice

How old is the Earth?

• 5.6 billions years old

• 4.7 millions years old

• 3.5 million years old

• 4.6 billions years old

Multiple Choice

Jellyfish are one of the oldest species on Earth. In what time period did they first appear?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Multiple Choice

Which vertebrates have been around longer?

• mammals

• reptiles

Multiple Choice

Dinosaurs, small mammals, and birds are found in this time period.

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Multiple Choice

In which time period are we currently living?

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era