Earth History & Geological Time

The Geologic Time Scale is a record of what?

• old geologists
• sweet geology music
• the known history of rocks and fossils
• a list of every living thing ever

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

Paleozoic, Mesozoic & Cenozoic are all

• Epochs
• Eras
• Periods
• Eons

Which is the most recent era of time- the one that we are currently in?

• Mesozoic 
• Paleozoic 
• Cenozoic 
• Precambrian 

True or False: Geologists subdivide periods into eras.

• False
• True

Describe how geologists separate time periods.

• by special events that have happened in that period.
• By looking at the Relative Time of a Fossil
• By counting the years a fossil has been preserved

Name the 4 time frames 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

Which division on the geologic time scale is the shortest?

• epoch
• era
• eon
• period

The time span that lasted the longest was the...

• Precambrian
• Paleozoic
• Mesozoic
• Cenozoic

The Era with the largest extinction we know of is the... 

• Mesozoic era
• Precambrian era
• Paleozoic era
• Cenozoic era