information on all the natural disasters 50 linesatleast.

Anatural disasteris a major adverse event resulting fromnatural processesof the Earth; examples includefloods,severe weather,volcanic eruptions,earthquakes, and other geologic processes. A natural disaster can cause loss of life or property damage, and typically leaves some economic damage in its wake, the severity of which depends on the affected population 'sresilience, or ability to recover.

An adverse event will not rise to the level of a disaster if it occurs in an area without vulnerable population.In a vulnerable area, however, such asSan Francisco, an earthquake can have disastrous consequences and leave lasting damage, requiring years to repair.

Avalanches

DuringWorld War I, an estimated 40,000 to 80,000 soldiers died as a result of avalanches during the mountain campaign in theAlpsat theAustrian-Italianfront, many of which were caused by artillery fire

Earthquakes

. About 60,000 people are thought to have died in this earthquake.

Anearthquakeis the result of a sudden release of energy in theEarth 'scrustthat createsseismic waves. At the Earth 's surface, earthquakes manifest themselves by vibration, shaking and sometimes displacement of the ground. The vibrations may vary in magnitude. Earthquakes are caused mostly by slippage within geologicalfaults, but also by other events such as volcanic activity, landslides, mine blasts, andnuclear tests. The underground point of origin of the earthquake is called thefocus. The point directly above the focus on the surface is called theepicenter. Earthquakes by themselves rarely kill people or wildlife. It is usually the secondary events that they trigger, such as building collapse, fires,tsunamis(seismic sea waves) and volcanoes, that are actually the human disaster. Many of these could possibly be avoided by better construction, safety systems, early warning and evacuation planning.

VolVolcanoescan cause widespread destruction and consequent disaster in several ways. The effects include thevolcanic eruptionitself that may cause harm following the explosion of the volcano or the fall of rock. Second,lavamay be produced during the eruption of a volcano. As it leaves the volcano, the lava destroys many buildings and plants it encounters. Third,volcanic ashgenerally meaning the cooled ash - may form a cloud, and settle thickly in nearby locations. When mixed with water this forms a concrete-like material. In sufficient quantity ash may cause roofs to collapse under its weight but even small quantities will harm humans if inhaled. Since the ash has the consistency of ground glass it causes abrasion damage to moving parts such as engines. The main killer of humans in the immediate surroundings of a volcanic eruption is thepyroclastic flows, which consist of a cloud of hot volcanic ash which builds up in the air above the volcano and rushes down the slopes when the eruption no longer supports the lifting of the gases. It is believed thatPompeiiwas destroyed by a pyroclastic flow. Alaharis a volcanic mudflow or landslide. The 1953Tangiwai disasterwas caused by a lahar, as was the 1985Armero tragedyin which the town of Armero was buried and an estimated 23,000 people were killed canic eruptionsFloods

floodis an overflow of an expanse of water that submerges land.The EUFloods directivedefines a flood as a temporary covering by water of land not normally covered by water.In the sense of "flowing water", the word may also be applied to the inflow of thetide. Flooding may result from the volume of water within a body of water, such as ariverorlake, which overflows or breaks levees, with the result that some of the water escapes its usual boundaries.While the size of a lake or other body of water will vary with seasonal changes in precipitation and snow melt, it is not a significant flood unless the water covers land used by man like a village, city or other inhabited area, roads, expanses of farmland, etc.

TheLimpopo River, in southernMozambique, during the2000 Mozambique flood

Some of the most notable floods include:

Tsunami

Tsunamis can be caused by undersea earthquakes as the one caused by the 2004 Indian Ocean Earthquake, or by landslides such as theone which occurred at Lituya Bay, Alaska.

• The 2004 Indian Ocean Earthquake created theBoxing Day Tsunami.
• On March 11, 2011, atsunami occurred near Fukushima, Japanand spread through the Pacific

Avlanche

Earthquake

Volcanic eruption

Volcanic eruptions