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15
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What are the three eras in order from oldest to newest?
Paleozoic, Mesozoic, Cenozoic
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15
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What are the three long units of time between Precambrian Time and the present called?
Eras
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15
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What are eras subdivided into?
Periods
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banana
Go to last place!
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shark
Other team loses 5 points!
Okay!
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shark
Other team loses 15 points!
Okay!
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baam
Lose 15 points!
Oops!
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boom
Lose 50 points!
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shark
Other team loses 20 points!
Okay!
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rocket
Go to first place!
Okay!
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lifesaver
Give 15 points!
Oops!
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trap
No points!
Oops!
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magnet
Take 15 points!
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rocket
Go to first place!
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thief
Give points!
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25
15
×
What information did scientists use to develop the geologic time scale?
Information from rock layers and index fossils
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15
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Where do the names of many geologic periods come from?
Places where geologists first described the rocks and fossils of that period
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baam
Lose 15 points!
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seesaw
Swap points!
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gift
Win 5 points!
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lifesaver
Give 15 points!
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15
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What is the first division of geologic time called?
Precambrian Time
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15
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What era are we in?
The Cenozoic Era
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15
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What period are we in?
The Quaternary Period
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15
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Why did geologists develop the geologic time scale?
The time span of Earth's past is so great that words like century, decade, year, month, week, and day don't suffice
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15
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What is the geologic time scale?
A record of the geologic events and the evolution of life forms as shown in the fossil record
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