User talk:Kirishanthi

This article is about the natural hazards that may lead to disasters. For natural disasters, see Natural disaster. A natural hazard or geophysical hazards [1] is a threat of an event that will have a negative effect on people or the environment. Many natural hazards are related, e.g. earthquakes can result in tsunamis, drought can lead directly to famine and disease. A concrete example of the division between hazard and disaster is that the 1906 San Francisco earthquake was a disaster, whereas earthquakes are a hazard. Hazards are consequently relating to a future occurrence and disasters to past or current occurrences Flood

The Limpopo River, in southern Mozambique, during the 2000 Mozambique flood Floods are the result of prolonged rainfall from a storm, including thunderstorms, rapid melting of large amounts of snow, or rivers which swell from excess precipitation upstream and cause widespread damage to areas downstream, or less frequently the bursting of man-made dams or levees. Tropical cyclones can result in extensive flooding and storm surge Tsunami

The tsunami caused by the December 26, 2004 earthquake strikes Ao Nang, Thailand. A tsunami is a wave of water caused by the displacement of a body of water. The word comes from Japanese words "tsu" meaning harbor and "nami" meaning wave (tsu+nami=harbor wave). Tsunami can be caused by undersea earthquakes as in the 2004 Indian Ocean Earthquake, or by landslides such as the one which occurred at Lituya Bay, Alaska. Meteotsunamis are caused by meteorological phenomena. A megatsunami is an informal term used to describe very large tsunamis. The largest waves are caused by very large landslides, such as a collapsing island, into a body of water. The highest tsunami ever recorded was estimated to be of 524m (1742 ft) vertical run-up on July 9, 1958,in Lituya Bay,Alaska. Drought A drought is an abnormally dry period when there is not enough water to support agricultural, urban or environmental water needs. Extended droughts can result in deaths by starvation or disease, and can result in wildfires. Scientists warn that global warming may result in more extensive droughts in coming years. Heat wave A heat wave is a hazard characterized by heat which is considered extreme and unusual in the area in which it occurs. Heat waves are rare and require specific combinations of weather events to take place, and may include temperature inversions, katabatic winds, or other phenomena. There is potential for longer term events causing global warming, including stadial events (the opposite to glacial 'ice age' events), or through human induced climatic warming. Soures -    http://en.wikipedia.org/wiki/Natural_hazard#Flood