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■ 7 



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500 f 



APPS0XIM«T£ OISTHNCE IN «»ROS ' 



Figure 47 — Aerial view of the ice pack showing a thick network of pressure ridges. 

 The extreme height of these ridges is ahout 25 feet. (U.S. Air Force.) 



.j* — 



■ t-4 



K 



i\ 



Figure 48 — Heavily hummocked and rafted ice. (Source unknown.) 



54 



