a.
What does an unconformity in a sequence of rock layers reveal about geologic history?
a.
a rock layer must have turned upside down.
b.
a layer of rock might have eroded.
c.
the layers must cover hundreds of square miles.
d.
the layers must have been deposited very quickly.
Answers: 2
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What does an unconformity in a sequence of rock layers reveal about geologic history?
a.
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