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15
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What does absolute dating tell us?
The numerical age of a rock or fossil
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15
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Where in Australia are stromatolites found?
About 100 km north of Perth
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According to the Law of Superposition where are the oldest rocks?
At the bottom
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What is the oldest known type of fossil?
Stromatolites
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banana
Go to last place!
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star
Double points!
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shark
Other team loses 20 points!
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banana
Go to last place!
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15
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What created stromatolites?
Cyanobacteria
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15
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According to the Law of Superposition where are the youngest rocks?
At the top
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heart
Other team wins 20 points!
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gift
Win 25 points!
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fairy
Take points!
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25
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banana
Go to last place!
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What does relative dating tell us?
Which fossil or rock is older or younger
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15
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Which dating method uses radioactive isotopes?
Radiometric dating
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What method gives the exact age of a fossil?
Absolute dating
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Which isotope is used for dating very old rocks?
Uranium-238
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What type of rock forms from compacted sediment?
Sedimentary rock
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thief
Give points!
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rocket
Go to first place!
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gift
Win 15 points!
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thief
Give points!
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15
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What does the Law of Superposition help scientists determine?
The relative age of rocks and fossils
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What do sediments form over time?
Horizontal layers
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