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rock layers which have remained undisturbed since the cretaceous era could be examined to see if they show any sign of the effects of very large amounts of acid rain on metal which do not dissolve in water such as iron and lead
rock layers which have remained undisturbed since the cretaceous era could be examined to see if they show any sign of the effects of very large amounts of acid rain on metal which do not dissolve in water such as iron and lead
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