2. 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.
3. 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.
4. 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.
