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August 4, 2015

Homework Help: Science

Posted by Anonymous on Wednesday, November 6, 2013 at 11:19am.

After a rock layer is eroded, which additional event must occur to create an unconformity, or a gap in the geologic record?

a. an earthquake or motion along a fault.
b. new deposits of sediment must build up on the eroded area.
c. folding of sedimentary rock layers.
d. a volcanic eruption.

Is this A? My lesson gives a definition for unconformity as "a rock or sediment surface separating two layers of different ages."

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