Tidal waves actually have nothing to do with tides, and nothing to do with ordinary ocean waves. Find out what causes them on this Moment of Science.
The first thing you need to survive an asteroid collision is knowledge of when it's coming.
You know how animals are supposed to be able sense disasters before they happen? Well some believe it’s a myth, though there are lots of reports of animals behaving strangely days before the tsunamis hit in Indonesia. Hundreds of thousands of ants were seen scurrying away from the beach. Elephants, dogs, and zoo animals were all reported to have been acting strangely. What can explain it? Learn more on this Moment of Science.
Ordinary ocean waves are caused by the action of wind, like ripples on a wind-blown pond. Even the impressive surf of the Pacific got its start as wind blowing across the open water. The height of such waves depends on how fast the wind is blowing, and how much open water the wind travels across.