Tsunamis

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.

Pictures of volcanoes