Themes: Fault Lines, Earth Science, Nonfiction, Tween. Pressure in three types of faults builds with a deadly force, causing earthquakes. When this force of nature strikes, it can send shock waves for hundreds of miles, putting people and property in danger. Scientists study fault lines and earthquakes to save lives and prevent destruction. Red Rhino Books Nonfiction is the first Hi-Lo children's nonfiction series at a first-grade reading level for students in grades 4-7. Visually appealing fullcolor photographs and illustrations-along with fun fact boxes-keep these books flowing. Also includes prereading comprehension questions along with a 20-word glossary for further reading support.