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15
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What is a fossil?
They are mineralized remains or evidence of plants and animals that lived long ago
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What is a key bed?
It is a layer of rock that scientists can clearly identify.
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When many species go extinct at the same time
Mass extinction
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How are body fossils formed?
They form when the body of a dead plant or animal is covered in sediments.
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banana
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gift
Win 20 points!
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rocket
Go to first place!
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thief
Give points!
5
10
15
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25
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seesaw
Swap points!
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rocket
Go to first place!
Okay!
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shark
Other team loses 20 points!
Okay!
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banana
Go to last place!
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15
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What is a mass extintion?
It happens when many species go extinct at the same time
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What is one famous example of a key bed?
A thin layer of clay that is called the K-T boundary
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What is this?
Geologic time scale
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What is a geologic time scale?
Fossils appear in rock strata in a certain order. This record tells how organisms have changed over time
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What do scientists use to identify key beds?
They use index fossils or characteristics unique to rock layers to identify the key bed
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They are the particles from death organisms, along with pieces of rock
Sediment
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lifesaver
Give 25 points!
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rocket
Go to first place!
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shark
Other team loses 25 points!
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lifesaver
Give 15 points!
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It is a layer of rock that scientists can clearly identify
Key bed
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Layers of rock that have the same index fossils are not the same age. Is this true or false?
False
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Pollens cannot form fossils.     Is this true or false?
False
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