Disasters: Tropical Cyclone and Big Electric Spark

Topics: Tropical cyclone, Hurricane Katrina, Volcano Pages: 9 (2822 words) Published: March 5, 2014
What is a disaster?
Disaster, in this article, a sudden, accidental event that causes many deaths and injuries. Most disasters also result in significant property damage. Common natural causes of disasters include earthquakes, floods, hurricanes and typhoons, and tornadoes. Tsunamis (popularly, but incorrectly, known as tidal waves), volcanic eruptions, wildfires, and landslides and avalanches rank among the other natural forces that sometimes create disasters. Man made

Not all disasters are produced by the forces of nature. Many modern-day disasters involve accidents aboard passenger-carrying airplanes, ships, or railroads. Other “man-made” disasters can be traced to the collapse of buildings, bridges, tunnels, and mines, as well as to explosions and fires unintentionally triggered by humans. Although acts of war and terrorism also inflict death and destruction, these events are intentional rather than accidental, and therefore are not considered disasters in the context of this article. For information on these topics. Natural disaster

Natural Disaster, event of nature that takes human lives or destroys property.

Blizzard
Blizzard, severe storm characterized by extreme cold, strong winds, and a heavy snowfall. These storms are most common to the western United States but sometimes occur in other parts of the country. According to the U.S. National Weather Service, winds of 35 mph (56.3 km/h) or more and visibility of 0.25 mi (0.40 km) or less are conditions that, if they endure for three hours, define a blizzard. The great blizzard of March 11-14, 1888, which covered the eastern U.S., was perhaps the most paralyzing of any storm on record.

Cyclone
Cyclone, in strict meteorological terminology, an area of low atmospheric pressure surrounded by a wind system blowing, in the northern hemisphere, in a counterclockwise direction. A corresponding high-pressure area with clockwise winds is known as an anticyclone. In the southern hemisphere these wind directions are reversed. Cyclones are commonly called lows and anticyclones highs. The term cyclone has often been more loosely applied to a storm and disturbance attending such pressure systems, particularly the violent tropical hurricane and the typhoon, which center on areas of unusually low pressure.

EARTHQUAKES
WHAT CAUSES AN EARTHQUAKE?
Earthquakes are movements in Earth’s crust. The crust is Earth’s rocky outer layer, the solid ground that we live on. Earth’s crust is broken up into many gigantic sections of rigid rock called plates. The plates slide around slowly on a layer of hot, melted rock deep inside Earth. Sometimes the plates crash together. Sometimes the edge of one plate slides under another plate. Faults are cracks in Earth’s crust between the huge plates. Earthquakes usually happen along faults. The plates on each side of a fault press against each other with tremendous force. An earthquake occurs when the rock along the edge suddenly gives way. Huge chunks of rock underground break and move. They can jolt upward or they can dive down. Sometimes the blocks of rock along a fault grind sideways past each other. The place where the rock breaks is called the focus of the earthquake. It is usually underground. The breaking and moving makes waves travel through the ground. The waves go through the ground the way waves go through water. The ground ripples and shakes. The place on the ground directly above the focus is called the epicenter. Earthquakes are strongest near their epicenters. Earthquake waves go out in big circles. Waves made by a powerful earthquake can travel thousands of miles! WHERE DO EARTHQUAKES HAPPEN?

Earthquakes are most common in places where Earth’s plates bump against each other. More earthquakes happen in the area around the Pacific Ocean than anywhere else. The plate that makes up the bottom of the Pacific is constantly squeezed by the surrounding plates. The pressure causes earthquakes around the edges of the plate....
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