The origin of the earth ( motion picture):  its structure and composition/ 
Open University. 
 - Milton Keynes:  Open University,  1972. 
 - 1 film reel (25 min.) : sd., b&w. ; 16 mm. 
<br/><br/> Illustrates the structure and physical properties of the Earth's crust and upper mantle as determined mainly by seismology and gravity.  backup in U-matic 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth--Crust.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Earth--Origin.<br/>Earth--Surface.