how dangerous can tsunamis be?

Question

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Answer 1

what are 3 facts about tsunamis?

1. They move the entire body of water from floor to surface
2. They move at high speed, for example 500mph
3. They have massive wave length

how dangerous can tsunamis be?
They are dangerous to anything in their way
where in the world is tsunamis mostly common?

The pacific ring the ring of fire, this is due to the techtonic instability in the region

how does tsunamis begin?
1. A shift upwards or downwards in the sea floor causing a displacement of water that then ripples out in waves (usually no higher than 10m)
2. A large body entering them water causing a displacement of water that moves as a wave (if the body is large enough this is a megatsunami)

Remember I have answered all your questions

Answer 2

Tsunamis can be extremely dangerous. Do you remember from 2 years ago, the incredibly devastating tsunami in the Indian Ocean? Exact numbers aren't known, but it seems likely that over 200,000 people died in that event. Coastal flooding was catastrophic, wiping out thousands of villages all across the ocean basin. It was also a frequently videotaped event, and if you do a google (or yahoo) video search on "indian ocean tsunami" you'll find many examples of amateur video of the event. These videos are just stunning, and frightening, especially since most of these people didn't really understand what they were seeing when they shot it.