Fossils and Geologic Time - Dawkins

Earth's long history is divided into units of time. Which of the following is the largest?

• Era
• Period
• Epoch
• None of the above

Which of the following is NOT an example of an era?

• Paleozoic
• Cenozoic
• Holocene
• Mesozoic

Precambrian refers to ---

• the earliest span of time in Earth's history
• the current unit of time we live in
• a future span of time in the Earth

Epochs are smaller than eras.

• True
• False

Scientists believe that humans first appeared in the --- era.

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

Dinosaurs inhabited the --- era.

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

The geologic time scale is ---

• a record of historically significant geologists.
• the known history of the Earth and its rocks and fossils.
• some great music that geologists listen enjoy.
• a scale for referencing animal extinctions.

Paleontologists and geologists believe the Earth is ---

• 2021 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

Geologic time has ended.

• True
• False

Scientists believe that the largest extinction event took place in the --- era.

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic