The mushroom growing out of the Test A explosion in air has now 

 reached an altitude of five miles. Veiling the mushroom top is the ice 

 cap, or scarf cloud, believed to be composed of myriad tiny ice crystals. 

 The mushroom itself is a mixture of vapor, smoke, soot, and rqdioactiv? 



fission products. 



Pht§ 20 



