Two Questions! Will give brainliest!

What does the law of superposition tell about the relative ages of rocks?

That the deeper you go into rock layers, the older the rocks are

that the deeper you go into rock layers, the younger the rocks are

that the oldest rock layer is always on top

that the oldest rock layer is always undisturbed

•

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

An earthquake or motion along a fault

new sediment deposits build up on the eroded area

radioactive decay along a fault

avolcanic eruption near the eroded area