Tsunamis are giant waves caused by undersea earthquakes or volcanic eruptions that displace large volumes of water. A tsunami forms as the displaced water moves vertically and generates a 'whip' effect on the surface of the ocean. Though they travel very quickly, sometimes at 700 km/h, tsunamis can maintain much of their strength over thousands of kilometers due to the great depths of the oceans. Countries most often affected by tsunamis include those bordering the Pacific Ocean like Japan, Indonesia, Chile, Mexico, and the coastal regions of the United States like Hawaii.

1. ​My oral presentetion​by Mora
I am going to talk about the​ ​¡​tsunamis​!
The word tsunami comes from two Japanese words. Its meaning
"harbor" and nami means "wave".
​¿what are the​ ​tsunamis?
A tsunami is a wave or series of waves that occur in a body of
water to be violently pushed by a force that moves vertically. A
tsunami is caused by earthquakes or volcanoes that move the earth
at the bottom of the sea. This movement is called earthquake.The
sudden movement of water from the depth generates an effect of
'whip' to the surface that is capable of achieving giant waves.
Given that the usual depth of the Pacific Ocean is about 4,000
meters, can cause waves moving at 700 km/h as the waves lose
their force in inverse relation to its size, having 4,000 meters can
travel thousands of kilometers away without losing much strength​.

2. these are the countries most
affected by tsunamis
Russia, Taiwan, Indonesia, Australia, New Zealand, Mexico,
Guatemala, Costa Rica, Panama,​ ​Honduras, Chile, Ecuador,
Colombia,Peru,China, Japan and Hawaii.