Natural disasters

tornadoA tornado is a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. They are often referred to astwisters or cyclones,[1]

 although the word cyclone is used in meteorology, in a wider sense, to name any closed low pressurecirculation.

hurricane

Tropical cyclones typically form over large bodies of relatively warm water. They derive their energy through the evaporation of water from the ocean surface, which ultimately recondenses into clouds and rain when moist air rises and cools to saturation. This energy source differs from that of  imparted by the Earth's rotation as air flows inwards toward the axis of rotation. As a result, they rarely form within 5° of the equator.[5] Tropical cyclones are typically between 100 and 4,000 km

tsunamiIt is a series of water waves caused by the displacement of a large volume of a body of water, generally an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explosions(including detonations of underwater nuclear devices), landslides, glacier calvings, meteorite impacts and other disturbances above or below water all have the potential to generate a tsunami

Earthquakehe 2010 Haiti earthquake was a catastrophic magnitude 7.0 mwearthquake, with an epicenter near the town of Léogâne (Ouest Department), approximately 25 kilometres (16 mi) west of Port-au-Prince, Haiti's capital. The earthquake occurred at 16:53 local time (21:53 UTC) on Tuesday, 12 January 2010.

floodA flood is an overflow

of water that submerges land which is usually

dry.The European Union (EU) Floods

Directive defines a flood as a covering

by water of land not normally covered by

water

avalanchAn avalanche, also called avalanche (Gallicism) is the displacement of a layer of snow or dirt downhill, which may incorporate part of the substrate and vegetation cover of the slope