Precambrian Review

What came first?

• Paleozoic
• Mesozoic
• Cenozoic
• Precambrian

How old is the Earth?

• 46 billion years
• 4 billion years
• .46 billion years
• 4.6 billion years

About how much of Earth's history is made up of the Precambrian time?

•  88% 
• 12%
• 2%
• 50%

Cyanobacteria created this gas during the Precambrian Era.

• Carbon Dioxide
• Hydrogen
• Nitrogen
• Oxygen

During the precambrian age: 

• prokaryotes dominated
• dinosaurs dominated
• eukaryotes dominated
• archaea dominated

Why are fossils rarely found in Precambrian rock?

• There was no evidence of life in Precambrian time
• Rocks from Precambrian have yet to be discovered.
• Most Precambrian organisms did not have hard body parts that commonly form fossils.
• Precambrian rock is buried too deeply for geologists to study it. 

We know very little about Precambrian time because:

• Too many fossils existed
• Cyanobacteria destroyed the evidence
• Rocks are severely deformed with limited fossils available
• It is a conspiracy from the Obama administration to keep us in the dark

The lithosphere is composed of the 

• inner core and outer core
• crust
• crust and upper mantle
• crust and core

Which of the following is not a layer of the Earth?

• Core
• Mantle
• Mesosphere
• Crust

Which list shows the four time spans in order from oldest to youngest.

• Precambrian Time, Paleozoic Era, Mesozoic Era, Cenozoic Era
• Mesozoic Era, Precambrian time, Cenozoic Era, Paleozoic Era
• Paleozoic Era, Mesozoic Era, Precambrian Time, Cenozoic