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on 29 October 2014

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Volcanic eruptions
By: Adsaya, Amulya, Jasmeet, Sammi, Sharon
Intro to Volcanic eruptions.
In conclusion
In conclusion we would like to say is that volcanic eruptions are very much misunderstood. Especially when it comes to the pros and cons of a volcanic eruption, because as we have stated there are pros and cons to volcanic eruptions. We are well prepared to find out more truths about volcanoes.
What are the causes?
- occurs when 2 plates collide
- pressure in the magma chamber, it forces the magma to come up the main vent
- Shield volcanoes erupt frequently but they are gentle.
- Have constructive boundaries and when two crystal plates separate from each other
- Composite volcanoes have destructive boundaries
- Volcanoes may bulge before erupting
- When the earth’s mantle melts because of high temperature and high pressures, it flows through the cracks of the rock. Goes into chambers that are underneath the earth’s crust. Magma rises because it is less dense than rocks it rises.
What do you do in case of an eruption?
Some of the essentials;
>First aid kit
>Battery operated flashlight
>Hand crank radio or TV
>Extra clothes(long sleeves, pants)+ sturdy pants, sleeping pants
-Some safety precautions if your indoors;
>Choose a room to stay in [preferably without windows and above ground level]
>Close all doors, windows and dampers
>Turn off electricity, heat, gas, air conditioning and water
-Some safety precautions if outdoors;
>Seek shelter immediately (stay clear of areas with ash and/or volcanic fumes)
>Beware of mudflows if near a stream or river, move to higher elevation
>If you can’t avoid driving, do not turn on AC and keep windows closed
-Evacuate immediately
What are the effects?
> Ash from volcanic eruptions can make the soil fertile
> Eruptions create geothermal energy
> Volcanic gasses contain water
> Regulates Earth's temperature
- Cons:
> Eruptions cause loss of property and life, due to
to the flow of lava
> The ash is heavy and can make it hard to breath
Historical cases/Examples
The Eruption of Mount Vesuvius (August 24, AD 79)

-One of the most infamous eruptions in history
-Destroyed the cities of Pompeii and Herculaneum
-The eruption lasted 24 hours

The Eruption of Krakatoa (August 26-27, 1883)
-One of the most deadly eruptions
-created a series of tremendous explosions
-Made one of the loudest sounds on the planet (could even be heard from Australia)

The Eruption of Mount St. Helens (May 18, 1980)
-Lasted 9 hours
-The northern slope slid downward
-Caused a massive landslide and destroyed much of the surrounding forests

Thank you for listening to our
Diagram of a volcanic eruption
-Where do volcanic eruptions occur?
>Close to major tectonic plate boundaries
>Two active volcanoes are Heard Island and nearby McDonald Islands
>Active volcanoes nearest Australia are in New Zealand, Papua New Guinea,Indonesia and the Philippines
>Severely threaten lives, property, agricultural areas form South East Asia and the Australian region
-When do Volcanic Eruptions occur
>One to two times annually throughout the world
>Eruptions that occur after many years are usually the most powerful
>Volcanoes through the geological time are found in every Australia State and Territory for the previous 60 million years
A video by the national geographic
This video shows the ways volcanic eruptions look, and the eruptions aftermath.
Full transcript