Reading Metrics
Grade Level
Middle Grades (MG 4-8)
Book Level
6.2
Points
1.0
Fiction/Nonfiction
Nonfiction
Word Count
4232
Points per Word
0.000236
Page Count
32
Points per Page
0.03125
Description
Warplanes have been around for only about 100 years. How have they changed from biplanes and triplanes to jets that fly faster than the speed of sound? Learn about fighter planes that are invisible to radar and bombers that can destroy whole cities.