Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
6.6
Points
2.0
Fiction/Nonfiction
Nonfiction
Word Count
14401
Points per Word
0.000139
Page Count
96
Points per Page
0.020833
Description
Young readers will dig deep into this compendium of all things underground, from volcanoes and dinosaur bones to tombs, city works, and buried treasure.