Tsunamis are among the world's deadliest natural disasters. These giant waves have several causes, including underwater earthquakes and the eruption of volcanos. After hitting land, the waves can push nearly anything in their path, destroying property and killing both people and animals. Some of the worst tsunamis have taken hundreds of human lives. Nearly all tsunamis begin in a region of the Pacific Ocean called the Ring of Fire. Part of The Earth's Worst Natural Disasters series, The Worst Tsunamis on Record explains how these devastating natural disasters form and what people should do if they are ever in an area where one occurs.