Masterpieces of Science 



would immediately be attacked by rain, frost 

 and other atmospheric agents, and would event- 

 ually be chiselled, by these means, into a variety 

 of physical features. Denudation by the sea 

 differs from that effected by other agents, in that 

 it tends to produce an approximately level sur- 

 face, while subaerial denudation gives rise to 

 superficial irregularities. 



170 



