What are tsunamis? A tsunami is a series of waves caused by underwater earthquake, by a volcanic eruption, landslide, rapid changes in atmospheric pressure, or a meteorite.
How can you help? You can help by donating clothes and things to organizations who help people who have experienced bad weather conditions. If the people are related to you or if they are friends, you could help them by sheltering them if they lost their homes. If you are in the tsunami with them. You could give them food and try to find something that floats.