This book is part of a book series called True Books-Earth Science .

This book has been graded for interest at 8-10 years.

There are 48 pages in this book. This book was published 2012 by Scholastic .

Susan H. Gray holds bachelor's and master's degrees in zoology from the University of Arkansas in Fayetteville. She has taught classes in general biology, human anatomy, and physiology. She has also worked as a freshwater biologist and scientific illustrator. In her twenty years as a writer, Susan H. Gray has covered many topics and written a variety of science books for children.