Extreme Weather TSUNAMIS DiscoverRoo An Imprint of Pop popbooksonline.com Martha London
4 CHAPTER 1 HOW TSUNAMIS FORM A tsunami is a group of huge waves that hit land Most tsunamis are caused by earthquakes These earthquakes happen deep underwater The ocean floor is made up of many tectonic plates WATCH A VIDEO HERE
5 These huge plates move very slowly Sometimes two plates run into each other When that happens those plates can cause an earthquake A diver swims in a gap between two of Earth's tectonic plates
