Reading Metrics
Grade Level
Lower Grades (LG K-3)
Book Level
4.7
Points
0.5
Fiction/Nonfiction
Nonfiction
Word Count
2242
Points per Word
0.000223
Page Count
32
Points per Page
0.015625
Series
Great Engineering
Description
Tunnels allow people to cut through tall mountains or even travel deep underwater. Discover the engineering behind tunnels.