Презентація "Volcanic Eruptions and Hazards"

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A volcano is an opening, or rupture, in the surface or crust of the Earth or a planetary mass object, which allows hot lava, volcanic ash and gases to escape from the magma chamber below the surface.

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On Earth, volcanoes are generally found where tectonic plates are diverging or converging.

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There are three common types of volcano:
composite volcanoes, often the most deadly; 
shield volcanoes, which are large but generally less violent;
cinder cones.

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Erupting volcanoes can pose many hazards, not only in the immediate vicinity of the eruption.

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Lava has a temperature of more
than 1200 ° C, the rate of
2 to 40 kilometers

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The largest volcano on Earth is Hawaii's 
Mauna Loa. It is about 10 km tall from the sea floor to its summit (it rises about 4 km above sea level).

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The most active volcano in the continental USA is Mt. St. Helens (located in western Washington state).

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Volcanic eruptions continue posing ever-greater threats to life and property.

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South of Mexico City, Popocat petl has begun to come to life again.

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Another million people living
in the Naples area are threatened
by Mt. Vesuvius' continued unrest.

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