Many people acted heroically in the aftermath of Hurricane Katrina. The Coast Guard, for instance, rescued some 34,000 people in New Orleans alone, and many ordinary citizens commandeered boats, offered food and shelter, and did whatever else they could to help their neighbors.
Tidal waves, or tides, are a predictable, com-mon occurrence along coastal communities, generated by forces beyond Earthâthe gravitational pull of the sun and moon. However, tsunamis are not predictable. They are often generated by earth-quakes, volcanic activity, and slope failure.idal waves, or tides, are a predictable, com-mon occurrence along coastal communities, generated by forces beyond Earthâthe gravitational pull of the sun and moon. However, tsunamis are not predictable. They are often generated by earth-quakes, volcanic activity, and slope failure.
Tsunami-Tsunamis are ocean waves produced by earthquakes or underwater landslides. The word is Japanese and means harbor wave, because of the devastating effects these waves have had on low-lying Japanese coastal communities.sunami-Tsunamis are ocean waves produced by earthquakes or underwater landslides. The word is Japanese and means harbor wave, because of the devastating effects these waves have had on low-lying Japanese coastal communities.