Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
7.8
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
5672
Points per Word
0.000176
Page Count
64
Points per Page
0.015625
Series
Eyewitness Books
Description
Discover the origins of life on Earth, from the first bacteria through the age of giant dinosaurs to the coming of humans.