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

a. an earthquake or motion along a fault
b. new sediment deposits build up on the eroded area
c. radioactive decay along a fault
d. a volcanic eruption near the eroded area

I think that it is either B or D.

4 answers

Nope.

Then it must be C?

B is correct.

I find it funny that connexus found people cheating and changed the answers