Wrijjla Pierce 



The role of water. Upper photograph : The Mohave River near Victorville. 

 This river rises in the San Bernardino Mountains and loses itself in a desert sink. 

 What effect does it have upon the desert .►> 



Lower photograph: An irrigated orange ranch in the desert near Clareniont, 

 California. Thousands of acres of trees now grow where desert conditions 

 existed before irrigation. 



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