Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
6.4
Points
0.5
Fiction/Nonfiction
Nonfiction
Word Count
2746
Points per Word
0.000182
Page Count
32
Points per Page
0.015625
Description
Readers discover how humans have harvested this clean energy source, from Archimedes's sunbeam weapons to today's solar-powered movie theaters.