TSUNAMI
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Tsunami is a japanese word from a seismic sea wave generated by an undersea earthquake, landslide, or eruption. Most tsunami happen along the ring of fire. It is a zone of volcanoes and seismic activity. The zone encircles the pacific ocean.
Historically, tsunami has caused much destruction and death. Sibce 1819, about 40 tsunami have struct the hawaiian islands and since 1883, about 20 tsunamis have struck indonesia. The last one was on december 26, 2004, which caused over 100,000 deaths.
A tsunami can have a width of 100 to 200 km and may spread far across the deep ocean. The speed is as fast as a jet plane. When the wave reaches land it can be very high, about 15 m or more.
In Which Paragraph did you find the information about the cause of tsunami?