Reading Metrics
Grade Level
Upper Grades (UG 9-12)
Book Level
9.7
Points
23.0
Fiction/Nonfiction
Nonfiction
Word Count
116902
Points per Word
0.000197
Page Count
484
Points per Page
0.047521
Description
This book takes a look at an ordinary substance--salt, the only rock humans eat--and how it has shaped civilization from the very beginning.