Precambrian Test Review

Paleo-biosphere and Precambrian time

Earth Science

What is the Paleo-biosphere?

​- Paleo means older or ancient, especially relating to the geological past.

​- Use of the fossil record and carbon dating to gather evidence of Earth's broad history.

​- Geological time is vast!

​- Watch the video about the beginning of life on Earth. Be ready to compare features of early Earth to the features of Earth today.

Open Ended

In your own words. How do early Earth conditions and features compare to Earth conditions and features today?

Multiple Choice

Earth was formed how long ago?

• 5 million years ago

• 4.56 billion years ago

• 100,000 years ago

• 500 million years ago

Multiple Choice

What is the longest geological time period? It began at the origin of Earth and spanned over 4 billion years.

• Cambrian

• Precambrian

• Paleozoic

• Cenozoic

Open Ended

Why are Precambrian events so hard to determine? Provide at least one reason!

Multiple Choice

Earth early atmosphere is composed mainly of what gas below?

• O2

• CO2

• HCl

• Argon

Open Ended

What changed the contents of gases in the atmosphere?

Open Ended

Shields are composed of __________, Evidence of ___________, and important because _____________.

Open Ended

Stromatolites are composed of__________, Evidence of _____________, and are important because ________________.