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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.

User Dmnkhhn
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This happens when a rock layer erods
User Asano
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A layer of rock might have eroded.
User Manghud
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