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m 



FURTHER VIEW, ENYU ISLAND. In this later 

 view of the Able Test mushroom the cloud has 

 risen so high that an icecap has begun to form. 

 Gases rising just above the mushroom top are 

 greatly expanded and therefore cooled; their wa- 

 ter vapor content changes from gaseous to ice 



crystal state. A thin layer of myriad horizontal 

 crystals forms slightly above the top surface of the 

 mushrooms proper. This layer becomes increasingly 

 thicker, gradually settling down over the top of 

 the mushroom. Even after the formation of the 

 icecap the mushroom continues to rise. 





