Question

WILL GIVE MEDAL FAST!!!
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 sediment deposits build up on the eroded area
c radioactive decay along a fault
d a volcanic eruption near the eroded area

Answer 1

What do you think, @ITZHyper ?

Answer 2

I think it is a

Answer 3

It's either that or B.

I'm leaning towards B.
Here's an example:
There are layers A, B, and C.
Layer C erodes away, and then a new layer (we'll call this D) forms where layer C was.
So now it's layers A, B, and D.
If a scientist was looking at the layers, they would want to know what happened between Layer B and Layer D. But since layer C eroded away, they don't know, so there is a geological gap.
Does that make sense, @ITZHyper ?