How Sunami occour
How Tornado occur
How flood occur
Answers
A tsunami sometimes incorrectly referred to as a "tidal wave", also known as a seismic sea wave, is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explosions, landslides, glacier calvings, meteorite impacts and other disturbances above or below water all have the potential to generate a tsunami. Unlike normal ocean waves, which are generated by wind, or tides, which are generated by the gravitational pull of the Moon and the Sun, a tsunami is generated by the displacement of water.
Tornadoes have been documented on every continent except Antarctica. Tornadoes tend to occur in the middle latitudes in both hemispheres, between 30° and 50°. These latitudes are regions where the warmer subtropical warm air meets the colder polar air, with different wind speeds and direction.
A flood is an overflow of water that submerges land that is usually dry. The European Union Floods Directive defines a flood as a 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 the tide. Floods are an area of study of the discipline hydrology and are of significant concern in agriculture, civil engineering and public health.