Precambrian and Paleozoic Review

What is the geologic time scale

• a weight of history
• a scale of life and major events in Earth's history
• A 24 hour historical clock
• I don't know

What are era's divided into?

• eons
• periods
• epochs
• eras

Hadean, Archaen, and Proterozoic are in which era? 

• Precambrian
• Paleozoic
• Mezozoic
• Quaternary 

How old is the Earth?

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

What came first?

• Palezoic
• Mesozoic
• Cenozoic
• Precambrian

Describe Precambrian Time.

• makes up 88% of Earth's history. There are very little fossils from this time because it was so long ago and there was very little life on the planet at the time.
• It is based on Relative time and is compared to other times.
• It is  present day

Cyanobacteria created this gas during the Precambrian Era.

• Carbon Dioxide
• Hydrogen
• Nitrogen
• Oxygen

What layers of the Earth is the lithosphere composed of?

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

The Era when life began was...

• cenozoic
• paleozoic
• mesozoic
• precambrian

The longest Era was...

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic