This book is part of a book series called Ngk Chapters .

This book has been graded for interest at 7-10 years. This book is part of a reading scheme, meaning that it is a book aimed at children who are learning to read.

There are 112 pages in this book. This is a chapter book. Publishers market early chapter books at readers aged 6-10 years. This book was published 2017 by National Geographic Society .

KATHLEEN WEIDNER ZOEHFELD has been a children's books editor and writer for thirty years and have always kept one eye on curriculum needs, especially in science. She has written other books in the National Geographic Kids Readers series including, Dinosaurs and Rocks and Minerals .