Earth materials and processes an introduction to the rock cycle  unit 27 

 - London  Open university  1994 
 - 94p.  30cm. 
<br/><br/><label>ISBN: </label>0335163394 
<br/><br/><label>Subjects--Topical Terms: </label><br/>GEOLOGY HYDROLOGY METEOROLOGY
<br/><br/><label>Dewey Class. No.: </label>551  / OPE