J 



564 C. R. KEYES PROFILES AND STRUCTURES IN DESERT RANGES 



8. The differential sculpturing of erosion under conditions of aridity 

 are very different from those in a humid climate, in that the deflative 

 effects on the more resistant rock areas are very much less vigorous than 

 those of normal corrasion, and on the weak rock belts very much more 

 powerful. 



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