1. TornadosTornados

2. What is a Tornado? A tornado is a violent rotation of air that comes in contact with the ground pendent from a cumuliform cloud or underneath a cumuliform cloud but they are not always visible. Once the tornado reaches the ground, it starts to up debris around it. This can actually change the color of the tornado, because some dirt in the southern states is actually a deep shade of red

3. How are they formed? Tornadoes are formed when thunderstorm form, and it has conditions that are very violent. They start to develop near low-pressure areas of the high winds. The warmer air moves upward and the cooler air downward. When these two masses of air bump into each other, the main thunderstorm is formed. Fast moving, cold, dry air meet moister, warmer air. Usually, cold air moves underneath warmer air. In this case, though, air mass over-runs the warmer air. The warmer air then rushes upward at fast speeds. Air also blows in from the sides. This creates strong, twisting updrafts. This care of low-pressure becomes a tornado.

4. Variation of Tornados Weak: 69% of all tornados Less the 5% of tornado deaths Winds less the 110 mph Strong Tornadoes 29% of all tornadoes Nearly 30% of all tornado deaths May last 20 minutes or longer Winds 110-205 mph Violent Tornadoes Only 2% of all tornadoes 70% of all tornado deaths Lifetime can exceed 1 hour

5. What is a Tsunami? A tsunami is a series of waves generated by an undersea disturbance such as an earthquake. From the area of the disturbance, the waves will travel outward in all directions, much like the ripples caused by throwing a rock into a pond. The time between wave crests may be from 5 to 90 minutes, and the wave speed in the open ocean will average 450 miles per hour

7. What is a Hurricane? A hurricane is an intense, rotating oceanic weather system that possesses maximum sustained winds exceeding 119 km/hr (74 mph). It forms and intensifies over tropical oceanic regions. Hurricanes are generally smaller than storms in mid- latitudes, typically about 500 km (311 miles) in diameter. At the ocean’s surface, the air spirals inward in a counterclockwise direction. This cyclonic circulation becomes weaker with height, eventually turning into clockwise (anticyclonic) outflow near the top of the storm

8. Why Do Hurricanes Form and Where Are They Found? Hurricanes form and intensify over oceanic regions. They require sea-surface temperatures of at least 26°C (80°F) and the influence of the earth’s rotation to initiate a spinning circulation (Coriolis effect). The adjacent map shows the places on earth where these conditions are met for hurricane formation. Hurricanes generally form at the tail of the arrow and typically track following the arrow to its arrowhead. In North America, we call a storm that results from these conditions a hurricane. In other parts of the world, a hurricane is known by other names, including "typhoon" in the Western North Pacific and "tropical cyclone" in the Indian Ocean and the Western South Pacific

10. tornado http://www.youtube.com/watch?v=43VoMesUd2Q tsunami http://www.youtube.com/watch?v=WhuqKhXZkkY&fea ture=related http://www.youtube.com/watch?v=WhuqKhXZkkY&fea ture=related hurricanehttp://www.youtube.com/watch?v=s76Qn7b pCsQ&feature=relatedhttp://www.youtube.com/watch?v=s76Qn7b pCsQ&feature=related