Why on earth? 

 - [Washington, D.C.] :  National Geographic Society,  1988. 
 - 96 p. :  ill. 
 - Books for world explorers .
<br/><br/> Questions & answers present information on science topics, including human physiology, animal behavior, earth science, and natural science. 
<br/><br/><label>ISBN: </label>0870447068 (lib. bdg.) :  $8.50 0870447017 :  $6.95 
<br/><br/><label>LCCN: </label>88025486 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Miscellanea.<br/>Questions and answers.
<br/><br/><label>Dewey Class. No.: </label>500