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Natural Disasters

The best prezi ever
by

Natalie Cohen

on 31 May 2011

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Transcript of Natural Disasters

Natural Disasters What is a natural disaster A natural disaster is a disaster caused by nature that can lead to great damage and loss of life. There are several types of natural disasters some being a lot deadlier than others . Tornadoes A tornado is a swirling column of warm and cold air. The winds inside a tornado can reach speeds of up to 300 mph making it one of most powerful natural disasters. An Earthquake happens when two plates of the earth rub against each other to cause violent shaking motion and cracks on the surface. An earth quake occurs every thirty seconds somewhere in the world. A Blizzard is a severe snowstorm including winds that are more than 35 miles per hour.

The wind factor is the only difference between a regular snow storm and a blizzard.

It has to snow at least 3 hours with high winds and the visibility of only a quarter mile. Blizzard A dust storm is a strong, violent wind that carries fine particles like silt, clay, dust and other materials for long distances.
The fine particles swirl around in the air during the storm.
The scary thing about a dust storm is that they can spread over hundreds of miles and rise over 10,000 feet (305 meters) They also have wind speeds of at least 25 miles per hour (40 kilometres). dust storm is basically when strong winds blow sand off the surface everywhere Dust Storm Floods A flood is excess of water drowning the land. There are lots of different causes of floods. Sometimes an overflow in the river due to constant and heavy rain fall can trigger a flood. In other cases another natural disaster like a hurricane or tsunami can lead to a flood. Usually in a flood there is so much water that the drainage system have little affect and the whole town overflows with water. Sometimes the heavy rainfall causes the dams to overflow and leak all the water to nearby towns leaving them to flood. A hurricane is a powerful, rotating storm that forms over warm oceans.

Another name for a hurricane is a tropical cyclone.

Hurricanes have strong, rotating winds (at least 74 miles per hour), a huge amount of rain, thunder and lightning.

The winds of a hurricane rotate in a counter clockwise direction around the eye (the calm centre of a hurricane).

If this type of storm forms in the western Pacific Ocean, it is called a typhoon. Hurricane An avalanche is a sudden and a rapid flow of snow down a slope either due to natural triggers or by human activity Avalanche A wildfire is any fire that occurs in the countryside or a wilderness area.

It is also called brush fire, bushfire, forest fire, grass fire, hill fire, veld fire and wild land fire

A wildfire is different from other fires because of its size, and the speed that it spreads at and its capacity to change direction unexpectedly.

It can jump gaps like roads and rivers and continue to spread.

They can cause mass damage to both property and human life but they also have helpful affects on wilderness areas.

Some plants types only depend on the effects of fire for growth. Wildfire A drought is a period of months or years when a region receives consistently below average rain.

It can have a huge impact on the affected region. Although droughts can persist for several years, even a short, intense drought can cause significant damage and harm to the city or country. Drought The word "tsunami" is actually a Japanese word.
The first part, tsu, means harbor and nami means wave. So tsunami use to mean a harbor wave. However, the term is now used to refer to waves caused by earthquake or volcanic activity in or near the ocean floor.

When there is disturbance under the sea waves form and travel away from the center of the disturbance .

These waves can travel as fast as 450 miles per hour.

Deep in the ocean, tsunami can pass undetected under ships.

However, as they approach land, the water becomes more shallow and they rise up and crash on the shore.

The latest tsunami was the one in japan that occurred after the japan 9.1 richter scale earthquake.

On july 9 1958 in lituya bay alaska the highest tsunami ever was formed at a record of 1742 feet high at its highest point. Tsunami A volcanic eruption is the eruption of a volcano.
There are three types of volcanoes; dormant, extinct and active.


A dormant volcano is one that has not erupted in a long time but can.

An extinct volcano is one that cannot possibly erupt anymore, it is said to be dead.

An active volcano is the one that has a lot of activity going on inside of it and erupts frequently. When a valcanic eruption occurs lava shoots up in the air or runs down the side of the volcano.

Lava is molten hot rocks that burns anything alive in contact.


The ashes that are thrown up could block out the sun for a few days or even months.


A volcanic eruption also releases poisonos gases that could kill people and animals. Volcanic
eruptions There are 3 types of tornadoes, land tornadoes,Water spouts the ones that form over water and are strong enough to uplift ships and a dust devil.A Dust devil forms when hot air near the surface rises through a pocket of cold air and then it may begin to rotate. In 1981 a tornado ripped through alcona italy and lifted a sleping baby from its
carriage but put it down unharmed later
on the ground.

In 1974 a tornado picked up a school bus and dropped it on the roof of a school.Talk about getting to school on time with a grand entrance Volcanic eruptions do have some beneficial
effects too, they produce metals and minerals
.
The hot water produced by volacanoes
can be used to generate electricity.

Volcanic ash and lava produced fertile soils some of the worst floods of 2010 were
january 2011 brazil flood taking 700 lives and leaving 14000 people homeless
2010 columbia floods killed 138 people and 1.3 million were left homeless.
july 26 2010 heavy rain flooded most of pakistan. The natural causes include an earthquake or shaking of ground.Avalanches kill more than 150 people per year. statistics show that 93% of avalanche victims survive if dug out within 15 minutes, then the survival rate drops fast.
It is a myth that shouting can trigger avalanches because the pressure in sound waves is far too low, the sound waves in an explosion can cause an avalanche though, if occured too close to the surface. The largest blizzard ever was the great blizzard of 1888 in northeast us. it had winds close to a wind in hurricane, it snowed more than 50 inches in that storm.


The worst blizzard in canadian history was in saskatchewan. It lasted 10 days and stranded hundreds of people and the snow banks reached 8 meters. Earthquakes are measured by a Seismometer and recorded on a Richter scale.
The magnitude or strength of 3 of less isn't even felt by people but an earthquake measured more than 7 on a Richter scale can cause damage of great proportions. Some of the biggest quakes happen in areas which are not inhabited by people so not a lot of people get hurt. The 2010 haiti earthquake was recorded at a magnitude of 7.0 with 54 aftershocks. more than 3 million people were affected with 316,000 deaths, 300,000 injured and 100,000 left homelsess. 250,000 residences and 30,000 commercial buildings were severely damaged. The march 11 2011 japan earthquake with a magnitude of 9.0 was the deadliest ever to hit japan in 300 years. so far 9,523 deaths, 2,755 injuries and 16,094 missing people have been reported. over 125,000 buildings have been damaged or destroyed. In 1981 mexico city earthquake of 8.1 on a richter scale , 14 newborn babies were found alive inside a hospital building where they had been trapped for 7 days without food or water. Keep in mind that thirty thousand people were injured in this earthquake. Volcano Graph And Model Flood Model Drought Model Earthquake model
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