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OpenStudy (music_is_my_love):
how do layers B and D compare in age? If rock layers between B and D have eroded away, what is the boundary between B and D called?
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OpenStudy (music_is_my_love):
OpenStudy (anonymous):
Since D is farther down, we know that it is older, so the answer to the first question is that D is older than B. I can't answer the second one though, sorry.
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