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.
What is it? A tsunami, or seismic sea wave, is a series of destructive and very dangerous waves that result from earthquakes or other types of disturbances such as volcanic eruptions, meteorite impacts, and landslides. Its waves can get up to 30 m (100 ft) tall--or as high as a 10-story building.sunamis are extremely deadly and can't be predicted, so they are rarely caught on camera and you won't have much time to react when you spot the first wave coming in. They can wipe out an entire population of people and bring a city down to its knees.