Rollin down a backwood, Tennessee byway. One arm on the wheel, holdin my lover, with the other.
        
             
        
        
        
The answer to the question is the total surface area increases and chemical composition changes. Consider the breakdown of rock into smaller pieces, these fragments vary from huge rocks to smaller sizes. As they are so crushed and broken they tend to occupy much of the surface area than when its just a huge rock.
        
             
        
        
        
A mountain peak on a topographic map a  mountain would be represented by parallel contours of elevation according to the shape of the peak and the overall shape would be coming to a point or the peak of the mountain and since it is a mountain the contours would be fairly close together.
        
                    
             
        
        
        
Moosehead Lake. ...
Sebago Lake. ...
Chesuncook Lake. ...
Mooselookmeguntic Lake. ...
East Grand Lake.