Tornadoes are columns of spinning wind that whip at speeds of more than 200 miles per hour. Severe tornadoes can cause great destruction in their wake, leaving many people without homes. This book introduces readers to what happens during a tornado, as well as its causes and effects. Readers will get an up-close look at the threats posed by tornadoes, and how people can be prepared to survive this extreme weather. Vibrant photographs and achievable text will hook readers' interest as they encounter some of the most terrible tornadoes on Earth.