Volcanoes - Energy incandescent

In the interior of the Earth will surpass the 4,000 ° C. The eruptions of these giant released solid, liquid and gaseous constituents of high destructive power.

• A volcano ejected in explosive form, or column of gas, chunks of lava rock or, depending on their size, are called ash, sand, blocks or bombs.

• The lava flows or rarely cause casualties, as it slowly descended. In contrast, the toxic fumes expelled (water vapor, carbon dioxide and sulfur) affect the living up to 30 km radius.

• A rash carries a greater risk: that of volcanic avalanches. They are the desplazamientc a large mass of rocks at speeds above 100 m / sec, reaching to cover up to 1,000 km2.

• To determine whether a volcano is completely extinguished should not have given signs of geological activity in thousands of years. But, on the contrary, these long periods of inactivity beyond any scientific calculation for future eruptions.

• The largest recorded in the twentieth century was the Novarupta (Alaska), in 1912. Hit an unpopulated area and caused no deaths were expelled 21 km3 of volcanic material (a figure which reached the Hawaiian Kilauea in 230 years). The ash covered a 161 km radius.

• The Etna volcano is the oldest, its first eruption dates from 1500 a. C, while the Mauna Loa is the largest in the world in activity: 4170 and 4572 meters visible below sea level.

• In 1902, it produced seven successive eruptions in the Caribbean. The most destructive was the Mont Pelee (Martinique), which caused 29,025 deaths.

• One of the most recent and most destructive was on Pinatubo in the Philippines in 1991. After 600 years off, killing 800 people.

• The Vesuvius is one of the most dangerous parts of the globe, with 30 eruptions in the last thousand years of great magnitude. A new crisis of this nature would be a real risk to 60,000 people. The latest began in 1913 and ended in 1944.

• In 79 BC, Vesuvius buried Pompeii and Herculaneum, killing more than 3,000 people.
In the eighteenth century, were discovered the remains of these cities.