Biology, 07.07.2019 16:00 rouchedavisin4

In an unconformity between two layers of rock, how is the lower layer usually described? a. much older than the upper layer. b. much younger than the upper layer. c. the same age as the upper layer. d. a little younger than the upper layer

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In an unconformity between two layers of rock, how is the lower layer usually described? a. much ol...