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NATURAL DISASTERS

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by

Christina Dawson

on 14 November 2013

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Transcript of NATURAL DISASTERS

This is how a
Tsunami forms
TSUNAMI
Tsunami is basically like a wave crashing ashore but it's much, much bigger. When the water crashes ashore it can do large damage to the Earth's crust. These huge waves are made by underwater earthquakes. Tsunami's can also be caused by volcanic eruptions and underwater landslides.Tsunami's travel so fast that it can pass the pacific ocean within one day or maybe even less. They lose less power when they travel because of the wave lengths.
photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
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DEFINITION
An emergency situation posing significant danger to life and property that results from a natural cause.
VOLCANOES
Volcanoes demonstrate the incredible fiery power stored beneath the Earth. Volcanoes are essentially vents on the Earths crust where there is lava and gases from the planet's interior are emitted. When thick lava and gases rise up to the surface, volcanoes can explode spitting out lava,rocks and ash into the atmosphere. If there is not as much gas as lava then it usually means a less dramatic eruption. When a volcano is eruptive it can explode anytime but if a volcano is dormant it means that it wouldn't explode in present but it might explode in the future.
WILDFIRES
Uncontrolled flames fueled by weather, wind and dry ground. Wild fires can go through acres of land and consume everything in a matter of minutes. An average of 100,000 wild fires go through the U.S and kill more than 4-5 million acres of land each year. There are three things wildfires need to burn, firefighters call this the fire triangle: fuel, oxygen and a heat source.
FLOODS
Floods don't always happen because of rain, there are a lot of ways that a floods can be formed. The most common way is when river or lakes overflow their banks. Coastal floods happen when a big storm or a tsunami causes the ocean to surge inland. Floods take days to develop giving people time to prepare to run. Floods are very dangerous, they can sweep away everything in their path with the current. A hundred year flood is a large and destructive flood. Hundred year floods are the most frightening and dangerous flood. They would be expected to happen in a century. Water is a incredible type of disaster that has a large amount of destructive power.
Hurricanes
Hurricanes are giant, spinning tropical storms that pick up winds of 257 kilometers an hour and unleash more than 2.4 trillion gallons of rain a day. Hurricanes are destructive, they can cause lots of damage and sometimes cause tornadoes and/or Floods.
What Are The Effects that Volcanoes Can do to Humans And The Earths Crust?
Eruptions that are extremely large can be hazardous to people living near a volcano. The ash and toxic gases coming out from the volcano can cause lung damage.
Lava/magma will burn everything in it's path including humans, buildings and so on.
Lightning
How do Tsunamis effect the Earths crust and Humans?
Tsunamis sweeps everything in it's way including humans causing them to drown . They can also destroy well built buildings. Tsunamis may also speed up the rotation of the earth making the day shorter.
How do hurricanes effect humans and the Earths crust?
Hurricanes have high winds and can cause trees to fall and it becomes very dangerous for humans.
Lightning is a terrible and common disaster. The power of lightning is something that we can't imagine. There are about 100 strikes in every second. Each lightning bolt can contain up to one billion volts of electricity. Some types of lightning never leave the clouds. They travel within and between them.
How do floods effect humans and the Earths crust?
Floods can effect human health by pushing dirty and muddy water into their body. Floods can also drown people in their way.


This is a Tsunami
This is after
a Tsunami
How does lightning effects humans and the Earths crust?
Lightning can stop a humans heart by just hitting a human. Lightning can create massive amounts of electricity.

How do Wildfires effect humans and the Earths crust?
Even though wildfires are harmful and destructive to humans in the area where the fire is alight, wild fires play a very important role to our earth. They clear out all the dead leaves and grasses allowing sunlight to reach the ground enabling new plants to sprout.

Thank
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These are floods
This is a wild fire
This is firefighters putting out the fire with retardant and water.
This is a volcano erupting. Spitting out lava and toxic gases
This is a volcano
This is a satellite image of a hurricane
Full transcript