Sunday, August 23, 2009

The Natural Disasters



A natural disaster is the effect of a natural hazards (e.g. flood or earthquakes) that affects the environment, and leads to financial, environmental and/or human losses. The resulting loss depends on the capacity of the population to support or resist the disaster, and their resilience.

  • Earthquakes- An Earthquake is a sudden shake of the Earth's crust.The vibrations may vary in magnitude. The earthquake has point of origin underground called the "focus".
  • Volcanic Eruptions-An Eruption may in itself be a disaster due to the explosion of the volcano or the fall of rock but there are several effects that may happen after an eruption that are also hazardous to human life.
  • Limnic Eruption-A Limnic Eruption occurs when CO2 suddenly erupts from deep lake water, posing the threat of suffocating wildlife, livestock and humans. Such an eruption may also cause tsunamis in the lake as the rising CO2 displaces water. Scientists believe landslides, volcanic activity, or explosions can trigger such an eruption

  • Tsunamis- it can caused by undersea earthquakes.
  • Blizzards-A blizzard (or winter hurricane) is a severe winter scondition characterized by low temperatures, strongwinds, and heavy blowing snow. Blizzards are formed when a high pressure system, also known as a ridge, interacts with a low pressure system; this results in the advection of air from the high pressure zone into the low pressure area.
  • Cyclonic Storms-Cyclone, tropical cyclone, hurricane, and typhoon are different names for the same phenomenon a cyclonic storm system that forms over the oceans.
  • Hailstorms-Hailstorms (AKA hailstones) are rain drops that have formed together into ice.
  • Firewhirls-Sometimes the intense heat created by a major forest fire or volcanic eruption can create what is known as a firewhirl, a tornado-like rotating column of smoke and/or fire. This happens when the fire updraft concentrates some initial weak whirl or eddy in the wind. Winds associated with firewhirls have been estimated at over 100 mph. They are sometimes called fire tornadoes, fire devils, or even firenadoes.

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