What do cave passages at several different depths most likely indicate?
a. different rates of erosion
b. multiple aquifers below ground
c. changes in the water table over time
d. several deposits of limestone on top of one another

In order to help the student expand his/her knowledge I will help answer the question. This in hope that the student will get a piece of knowledge that will help him/her through his/her homework or future tests.

The different rates of erosion are what a cave with several different depths most likely indicates. This is due to the fact that caves are formed by a combination of erosion, pressure and tectonic forces.

The correct choice is A. different rates of erosion

I hope it helps, Regards.      

Answer mauritania is in the northwestern part of african, meaning its in the western hemisphere, and how do i know/ the map showed me so; ///: )

It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.