Wright, J. B. <br/><br/>
The geochemical history of the earth (motion picture)/ 
Open University ; narrator : J. B. Wright and R. S. Thorpe 
 - Milton Keynes :  The Open University Press,  1972 
 - 1 film reel (24 min.) :  sd., b&w ; 16 mm. + script 
<br/><br/> Backup in U-matic  Outlined the overall physical features of the earth. Emphasizes the there are chemical distinctions between different parts of the crust (the oceanic and continental crusts) and notes that discontinuities exist within the mantle although there maybe physical rather than chemical in nature  Bahan rosak (Lupus) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth--Internal Structure<br/>Earth--Crust
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Earth--Core