What is atsunami?

Answer 1

A Tsunami is similar to a tidal wave but generally bigger and caused by earthquakes that happen on the sea bed

Answer 2

A tsunami is a series of powerful ocean waves caused by underwater earthquakes, volcanic eruptions, or landslides. When these events displace a large volume of water, it creates a ripple effect that can grow into massive waves when it reaches shallow coastal areas, causing widespread destruction and flooding.

Answer 3

a great sea wave produced by a submarine earthquake ( or volcanic eruption or landslide)