Natural disasters Made by Frangulyan Sergey Lyceum №21, 8 «А»

Earthquake Earthquake-oscillations of the earth's surface caused by tectonic processes, volcanic activities or landslides of rocks. Sometimes these oscillations may be of an artificial nature and result from underground explosions, or other industrial human activities. In the world each year is about one million earthquakes, but most of them do not notice anybody, except professionals, armed with the appropriate equipment – they are so small.

Tsunami Tsunami - a giant wave caused by an underwater earthquake. More than 80% of tsunami occur on the periphery of the Pacific ocean. The first scientific description of the phenomenon gave Jose de Acosta in 1586 in Lima, Propose a powerful earthquake, then a tsunami 25 meters high burst onto land at a distance of 10 km.

Tornado A tornado is a vortex in the atmosphere that develops inside Cumulus clouds, and gradually descends to earth in the form of a column with a width at the base to 400 meters. The velocity of air in the funnel according to some estimates can reach 1300 km/h, the storm is moving at average speed from 20 to 60 km/h. After contact with the ground tornado left behind massive destruction. They lift into the air and transport it over long distances not only garbage, but also larger items, including trees, houses and transport.

Hurricane A hurricane is a tropical cyclone that occurs over the warm ocean surface and accompanied by heavy rains, squally winds and thunderstorms. It appears in the case when warm and humid air in contact with cold atmospheric masses of large volume. As a result, over the ocean, forming a funnel with the so-called "eye" in the center – the eye has a warm and calm weather, with winds at a speed of 117 km/h or more. All hurricanes come from the sea, and, once on dry land, quickly dissipate, causing before doing significant damage.

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