Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
6.9
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
7719
Points per Word
0.00013
Page Count
64
Points per Page
0.015625
Description
Two expert cavers, one experienced in cave rescue and the other a microbiologist, explore caves with the reader and explain how they were formed. The coauthor is Hazel A. Barton, with Marfé Ferguson Delano.