This book is part of a book series called World Almanac For Kids .

This book has been graded for interest at 9-12 years.

There are 352 pages in this book. This is a reference book. This book was published 2011 by World Almanac Books, US .

Richard Hantula has written, edited, and translated books and articles on science and technology for more than three decades. He was the senior U. S. editor for the Macmillan Encyclopedia of Science.