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15
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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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The types of organisms that are fossilized in a layer give clues about what the land was like.   Is this true or false?
True
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What is a key bed?
It is a layer of rock that scientists can clearly identify.
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monster
Reset all scores!
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magnet
Take 25 points!
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shark
Other team loses 10 points!
Okay!
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lifesaver
Give 20 points!
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15
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When many species go extinct at the same time
Mass extinction
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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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thief
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5
10
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25
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rocket
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shark
Other team loses 10 points!
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banana
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15
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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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Layers of rock that have the same index fossils are not the same age. Is this true or false?
False
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eraser
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gold
Win 50 points!
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rocket
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lifesaver
Give 20 points!
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15
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What are index fossils?
Fossils found in the same rock layers
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15
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Fossils found in the same rock layers
Index fossils
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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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Pollens cannot form fossils.     Is this true or false?
False
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What is the K-T boundary?
The clay layer formed from a meteorite impact at the end of the Mesozoic era
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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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