Why On Earth? :  [Questions and answers present information on science topics] / 
National Geographic Society (U.S.). 
 - Washington, D.C. :  National Geographic Society,  1988. 
 - 96 p. :  ill. ;  28 cm. 
 - Books for World Explorers .
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<br/><br/><label>ISBN: </label>0-87044-701-7 0-87044-706-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reference books<br/>Science--Miscellanea