Volcanoes 13

Toni i GuillemW

1.Eruption 2.The life of volcano 3.Volcanic Landforms 4.Underwater volcanoes 5.Living with volcanoes 6.Volcano words

Eruption In 1883,on an island in Indonesia,a volcano called krakatoa erupted . People more than 4.800 km away heard it.

The inside of the Earth is very hot,and some of the solid rock melts to form hot,liquid rock called magma. Inside a volcano: 1.Vent 2.Hard lava 3.Magma 4.Magma Chamber

The hole is called a vent. When magma leaves the vent,it becomes lava.

Some volcanoes form above a hot spot, which is a very hot place in the mantle, just below a plate. A theory called plate tectonics explains how volcanoes form.

Volcanic landforms are in many places in the world, in many different shapes and sizes. Fissure volcano. Shield volcano. Dome volcano. Ash-cinder volcano. Composite volcano. Caldera volcano.

Volcanoes produce lava and rocks we find on the surface. Magma forms igneous rocks. These fragments are called tephra.

Devils tower in Wyoming,USA,is another unusual shape. They formed 190,000 years ago when a volcano erupted.

The are flat plains,mountains ridges,canyons and treches. The ocean floor: 1.Ridge 2.Volcanic island 3.Trench 4.Underwater volcano 5.Canyon

The minerals and chemicals in the lava and ash make the soil fertile so it is good for farming. More than 1.5 million people live around Mount Vesivus,a volcano in the southern Italy.

Volcanologists study volcanoes in different ways. A change inside a volcano can mean an eruption is coming.