The best evidence that erosion has taken place would be provided by

There are more indicators that erosion has taken place, but the most obvious for the eye is that the place where there's erosion changes it's physical appearance. This change in physical appearance is manifested by losing land mass and thus the place is losing in height, as well as getting flatter and flatter over time.

Answerstratovolcanoes///near or in the ring of fire;

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; ///: )