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20
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Between 275 and 70 mya, the majority of fossils found are of dinosaurs. What can scientists conclude about the dinosaur population at the time?
Dinosaurs were the dominant animal alive during that time.
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seesaw
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star
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gift
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baam
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5
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Rock layers are called __________________.
Strata
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seesaw
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magnet
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fairy
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25
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lifesaver
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baam
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gift
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gift
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baam
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15
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Can animal footprints become fossils?
Yes! Since footprints are the traces of a living thing, they can be fossilized.
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5
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In what type of rock are fossils most commonly found?
Sedimentary
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15
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Ancient dragon flies are much larger than modern day dragon flies. What can scientists conclude about Earth's atmosphere in the past?
There was more oxygen in the air, which allowed the dragon flies to grow larger.
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15
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What is a fossil record?
It is the layers of rock and the fossils preserved in them.
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15
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What does relative dating tell us about fossils?
It tells which fossils are younger or older.
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10
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The earliest multicell organism fossils are of marine animals. What can scientists conclude about Earth at this time?
The Earth was primarily covered with water.
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15
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Radioactive dating can be used on which rock type(s)?
ONLY igneous rocks!
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15
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Why are fossils rarely found in metamorphic and igneous rocks?
The heat needed to create the rocks usually destroys the organism before it can become a fossil.
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15
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True or False: Items that indicate human life (like phones and pencils) can become fossils.
False! These items are not living or made directly by a living organism (like a footprint), so they can't become fossils.
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20
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According to the image, which rock layer is the oldest?
Layer A
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heart
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rocket
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rocket
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thief
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