Earthquake [videorecording]. 

 - Quezon City :  Felta. 
 - 1 videodisc (20 mins.) 
 - Earth Science Video Library .
<br/><br/> Exciting on location footage illustrates one of the most destructive forces of nature. Learn why vast amounts of potential energy is stored within the earth's crust. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Natural calamities.<br/>Earthquake.