Question

write a passage from on tsunami

Answer 1

A tsunami (from Japanese: 津波, "harbour wave";[1] English pronunciation: /suːˈnɑːmi/soo-NAH-mee[2]) or 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 eruptionsand other underwater explosions (including detonations of underwater nuclear devices), landslides, glacier calvings, meteorite impactsand other disturbances above or below water all have the potential to generate a tsunami.[3]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.

Tsunami waves do not resemble normal undersea currents or sea waves because their wavelength is far longer.[4] Rather than appearing as a breaking wave, a tsunami may instead initially resemble a rapidly rising tide.[citation needed] For this reason, it is often referred to as a "tidal wave", although this usage is not favoured by the scientific community because it might give the false impression of a causal relationship between tides and tsunamis.[citation needed] Tsunamis generally consist of a series of waves, with periods ranging from minutes to hours, arriving in a so-called "internal wave train".[5]Wave heights of tens of metres can be generated by large events. Although the impact of tsunamis is limited to coastal areas, their destructive power can be enormous, and they can affect entire ocean basins. The 2004 Indian Ocean tsunami was among the deadliest natural disasters in human history, with at least 230,000 people killed or missing in 14 countries bordering the Indian Ocean.

The Ancient Greek historian Thucydidessuggested in his 5th century BC History of the Peloponnesian War that tsunamis were related to submarine earthquakes,[6][7] but the understanding of tsunamis remained slim until the 20th century and much remains unknown. Major areas of current research include determining why some large earthquakes do not generate tsunamis while other smaller ones do; accurately forecasting the passage of tsunamis across the oceans; and forecasting how tsunami waves interact with shorelines.

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