Precambrian Era

Multiple Choice

Which BEST explains why scientists use the Geologic Time Scale?

• So we can see all the things that have ever existed.

• It makes it harder to understand when things formed.

• Earth's history is too short.

• Earth's history is so large.

Multiple Choice

What are the longest units on the Geologic Time Scale?

• epochs

• periods

• eras

Multiple Choice

What are the shortest units on the Geologic Time Scale?

• epochs

• periods

• eras

Multiple Choice

The Precambrian Era takes up _____ % of Earth's history.

• 85

• 88

• 98

Multiple Choice

Water was brought to Earth by _______.

• asteroids

• meteors

• comets

Open Ended

Describe what early Earth was like.

Multiple Choice

Which of the following life forms did NOT exist during the Precambrian Era?

• fish

• bacteria

• jellyfish

Open Ended

Why is there not a lot of fossil evidence from the Precambrian Era?

Open Ended

Describe what life would be like if you lived during the Precambrian Era? Could you survive? Why or why not?