Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
8.5
Points
2.0
Fiction/Nonfiction
Nonfiction
Word Count
10220
Points per Word
0.000196
Page Count
80
Points per Page
0.025
Description
This book is an overview of the history of Earth, the life that evolved on it, and known periods of mass extinctions, from the planet's origin to the present.