A tsunami is the proper name for a tidal wave. Tsunami can be caused by earthquakes, or by big storms such as hurricanes that have a storm surge.

It makes a huge wave that sweeps on to the land. They are so powerful they can sweep a heavy truck right off the ground.

Waves can be formed at any time without warning, and can move as fast as 200kph.

A tidal wave can be up to 300 metres high. Work out how high that is by measuring the height of the room you are in!

You don't get a lot of photos of tsunami, because you don't exactly stand around with a camera while one is coming at you! Never, never go down to a beach if a tsunami is coming, because you cannot outrun it. The safest thing to do is to get to high ground, because the tsunami will destroy everything in its path.

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