Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea.Tsunami last until five minutes to two hours,and It’s over 1,700-foot waves which was the largest ever recorded for a tsunami.The first wave of a tsunami is usually not the strongest,bur successive waves get bigger and stronger.
Tsunami’s are rare,they usually happen around twice a year,but they can have devastating effects.A Lot of houses can be destroyed by powerful waves.It can also destroy crops,roads,bridges,and airports,It can all be swept away!.
In the deep ocean,tsunamis can barely be noticed but can move fast as a jet plane,over 500 mph.A tsunami may be less than a foot (30 centimetres)in height on the surface of the open ocean.