Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
9.0
Points
4.0
Fiction/Nonfiction
Nonfiction
Word Count
22772
Points per Word
0.000176
Page Count
144
Points per Page
0.027778
Series
Venture Book
Description
This book explores some of the world's most unusual ecosystems found in caves, the deep sea, hydrothermal vents on the ocean floor, underground aquifers, and rock deep below Earth's surface.