A. Salton Sea, California; portion of the bed exposed by evaporation. 





^ , ■■■/*^..- ■, ,^;^;;^;. . "-^ 



1M . 



B. Medanos Spit, San Diego, California; the tops of the dunes are gray with 

 Mesembryanthemum killed by frost. 



C. Wind-throw in pine forest, Leech Lake, Minnesota. 



