This book is part of a book series called Timeline Science .

This book has been graded for interest at 8+ years.

There are 64 pages in this book. This is a reference book. This book was published 2017 by Silver Dolphin Books .

Emily Oachs is a graduate of the University of Minnesota in the Twin Cities. She currently works as an editor at a Los Angeles-based educational company. In her spare time, she writes nonfiction books for elementary readers.