Cain, Sandra E. <br/><br/>
Sciencing / 
Sandra Cain. 
 - 4th ed. 
 - Upper Saddle River, NJ :  Merrill/ Prentice Hall,  c2002. 
 - xvi, 319 p. : photos 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Study and teaching (elementary)<br/>Science--Study and teaching (Elementary)--United States<br/>Education, elementary--Activity Programs