From periodotite to granite  [motion picture] / 
an Open University production. 
 - San Diego, Calif. :  University Media  1979. 
 - 1 film reel (ca. 20 min.) :  sd., col. ;  16 mm. 
<br/><br/> An examination of the various rock types and their origins. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical geology.<br/>Rocks--Analysis.