Bethune, Helen, <br/><br/>
Why do glaciers move? :  and other questions about extreme environments / 
by Helen Bethune. 
 - 24 pages :  illustrations ;  21 cm. 
 - Why is it so science? Cambridge young readers. Level 6 .
 - Cambridge young readers.  Level 6. .
<br/><br/> 1973 
<br/><br/><label>ISBN: </label>0521137438 9780521137430 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology--Miscellanea--Juvenile literature.
<br/><br/><label>Dewey Class. No.: </label>551