Boothroyd, Jennifer  1972- <br/><br/>
What holds us to earth?: a look at gravity. 
Written by Jennifer Boothroyd 
 - Minneapolis, USA:   Lerner publishing group, inc.  c2011 
 - 32 pages;  colour illustrations;  27 cm. 
 - Lightning bolt books. Exploring physical science .
<br/><br/>includes glossary, bibliography and index 
<br/><br/> J E 
<br/><br/><label>ISBN: </label>9780761354307 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gravity- Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>J 531.14 BOOT