122 PHYSIOGRAPHY 



or beneath the edge of an ice-sheet, is a terminal moraine. The 

 terminal moraine left after the ice melts is not to be confused with 

 the terminal moraine on the glacier. The former is made up very 

 largely of the drift carried in the bottom of the ice and lodged be- 



Fig. 128. The moraines left by a small glacier; slope of Mont Blanc. 



neath its end, or in case of an ice-sheet, beneath its edge. A 

 terminal moraine formed beneath the ice becomes large only when 

 the end of the glacier remains nearly constant in position for a long 

 time. 



When the glacier melts, all the debris which it carried is left on 

 the surface. After the ice is gone, therefore, the whole surface 

 which it covered is likely to be strewn with drift. All the drift 

 deposited by the ice (not that deposited by water which accom- 

 panies it) which is not in thick belts accumulated at its edge, is 

 ground moraine. The area of ground moraine is nearly as great 

 as the area of the glacier itself. It would be just as great except 

 that the ice does not always carry debris at every point in its 

 bottom. When it melts, therefore, there are some areas of bare 

 rock. 



Lateral moraines exist on valley glaciers (p. Ill), but this name 

 is also applied to certain parts of the drift left by a valley glacier 

 after it melts. The lateral moraines which were on a glacier are 



