Erosion can make mountains because when the pieces of land collide, they form some mountains. This happens because the ground from below shoots up into a shape. Erosion can happen because of landslides and other things. This is the way Himalayas were believed to be made. This is how erosion can make mountains.
Hope this helps you!
Squall = storm
Affluent = millionaire
Deface = criminal
Calpurnia responds to scout and says her people isn't accepting for whites.