Geologic Time & Earth's Internal Structure

The earth is ______________of years old

• Hundreds

• Millions

• Billions

• Trillions

Mammals are a dominant group in which era?

• Cenozoic

• Mesozoic

• Paleozoic

• Cambrianozoic

What era did the formation of the earth occur?

• Paleozoic

• Precambrian

• Cenozoic

• Cambrian

How old do Paleontologists believe the Earth is?

• 2019 years old

• 3.6 billion years old

• 4.6 billion years old

• 4.6 million years old

What type of event usually marks the end of an Era

• A Mass Extinction

• A Quinceanera

• An earthquake

• A Volcanic Eruption

What are the four eras in order from OLDEST to NEWEST?

• Pre-Cambrian, Paleozoic, Mesozoic, Cenozoic

• Pre-Cambrian, Mesozoic, Paleozoic, Cenozoic

• Cenozoic, Mesozoic, Paleozoic, Pre-Cambrian

• Mesozoic, Pre-Cambrian, Cenozoic, Paleozoic

What era did trilobites, fishes, and other marine organisms dominate?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

Which era is the most recent, the one that we are currently in?

• Mesozoic

• Paleozoic

• Cenozoic

• Precambrian

Scientists chose where units of geologic time began and ended based on the appearance or disappearance of life.

• true

• false

The dinosaurs and reptiles were dominant in which Era?

• Precambrian

• Mesozoic

• Paleozoic

• Cenozoic