Tsunamis• A tsunami is usually caused by a powerful earthquake under the ocean floor. This earthquake pushes a large volume of water to the surface, creating waves. These waves are the tsunami.
Tsunami• In the deep ocean these waves are small. As they approach the coast these waves get bigger and more dangerous. Tsunami waves can cause tremendous damage when they reach land.• A tsunami can also be triggered by a volcanic eruption, landslide, or other movements of the Earth’s surface.
THE VOLCANO• The crust is outer layer of the Earth. It’s about 18 miles thick.• Molten rock is called lava when it comes out of the ground. It flows down the mountainside as a lava flow.• The Crater is a funnel-shaped hollow at the top of a volcanic cone.• The Magma chamber is a store of molten rock deep in side the Earth.