Normally, waves are caused by winds. Tsunamis are......... . They do not depend on winds or on tides, which is why the term "tidal wave" is ....... Instead, tsunamis occur ........ a massive amount of by a disruptive event such as an earth- water is suddenly forced .......10 quake, volcanic eruption, or meteorite strike. Even a small earthquake ......... millions of tons of debris to start moving down a slope on the sea floor, and this moving material ......... in a gigantic tsunami. the sea at a speed from 500 to 1,000 A tsunami travels .......... kilometers' per hour, so ......... very little time to give people on the 15 threatened coast any warning. As the tsunami reaches shallower water near land, it .......... greatly and gains height This huge mass of moving water can devastate large areas. It is .......... for people to know that the water level often drops suddenly before the wave comes.
Soon there will be a warning system for the Indian Ocean such as the one at already exists in the Pacific. Hopefully, this will reduce the death toll of future tsunamis.