Pre-Cambrian Era

How old do Paleontologists believe the Earth is?

• 2015 years old
• 3.6 billion years old
• 4.6 billion years old
• 4.6 million years old

The time scale of Earth History is called the:

• Earth Time Scale
• Geologic Time Scale
• Earth History Time Scale
• Radiometric Time Scale

Relative dating of rock layers tells us that the deeper we dig, _______.

• the younger the rocks get
• the smellier the rocks get
• the harder the rocks get
• the older the rocks get

Which organism appeared first?

• Development of Fish
• Appearance of Humans
• First single-celled organisms (Cyanobacteria)
• Appearance of Jellyfish and Corals

The first three eons were: Hadean, Archaean, and Proterozoic. They are better known as:

• PreCambrian Time

• Phanerozoic

• Mesozoic

• Cenozoic

What was the earth like during PreCambrian time?

• tropical climate with warm shallow seas

• vegetation and tectonic movement

• cooler temperatures because of nuclear winter

• intense volcanic activity, very warm temperatures

90% of Earth’s history occurred during which era?

• Precambrian

• Paleozoic

• Mesozoic

• Cenozoic

What time from was the Pre-Cambrian Era

• 500 million to 1 billion years ago

• 4.5 - 4 billion years ago

• 4.5 billion to 542 million years ago

• None of the Above

Early plants in precambrian times is...

• No Real Plants

• Ferns

• Pine Trees

• None of the Above

The precambrian time is which era in order

• 1

• 2

• 3

• 4