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English 8 Online
OpenStudy (horse_rider_133):

The diagram below shows a stack of rock layers. These layers have not changed position since they formed. Examine the diagram, and answer the question that follows. https://app39.studyisland.com/pics/67981LayerSequencewithFossils.gif If the age of Layer 4 is 400 million years and the age of Layer 1 is 500 million years, then the age of Layer 3 is?

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