Tornadoes - Smart Words Reader Author:Christine A. Caputo The United States gets an average of a thousand tornadoes a year; that's more than any other country! These twisting columns of air leave massive destruction in their wake. Learn how they start, where they hit, what types there are, how they are measured, and ways to stay safe in tornado conditions. — Packed with mind-blowing photos, informat... more »ive illustrations and maps, and cool facts, this book also introduces 20 "smart words" that are essential for grasping exciting science concepts.« less