Anatomy of a volcano  [videorecording] 

 - 1 videocassette (U-matic) (57 min.) :  sd., col. ;  3/4 in. 
 - Horizon ( videorecording) .
<br/><br/> Looks at events leading up to the eruption of Mt. St. Helens and analyzes the actual explosion, frame-by-frame. Shows how instruments are helping scientists gain a better understanding of how to prevent a natural wonder from inflicting catastrophic damage. 
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Saint Helens, Mount (Wash.)--Eruption, 1980