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volcano eruptions


Ubaid Hossenbaccus

on 22 April 2014

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Transcript of volcano eruptions

Volcanic Eruptions
A volcano is an opening, or rupture, in the surface or crust of the Earth or a planetary mass object, which allows hot lava, volcanic ash and gases to escape from the magma chamber below the surface.

A volcano erupts when magma escapes from inside the earth. Magma sometimes rises under enormous pressure, so it not only finds cracks in the earth's crust, it can also create them. When magma reaches the earth's surface it is called lava
Where are Volcanoes Caused?
Volcanic activity occurs at the boundaries of the Earth's tectonic plates which are large blocks moving between each other. The movement of these plates in the type of volcano formed, which influences its shape. They mostly occur at the ring of fire.
What Causes Volcanoes?
Where does the name volcano come from?
Famous Volcanic Eruptions
Volcanoes are named after
the Roman god of fire Vulcan.
Mount Tambora-The largest explosion ever recorded by human is the explosion of Mount Tambora. It ranked a 7( or "super colossal") on the Expolsivity Index, the second highest in the index of 8. During April 15th the eruption reached it's peak and when it exploded it was so loud it was even heard on the Sumatra Island which is more than 1,200 miles( 1,930 km) away. The eruptions death toll was estimated 71,000 people, and clouds of heavy ash came down on many far away islands.

Krakatao 1883- This volcano erupted 5 000 km away from Australlia. Ash from the eruption reached New York and London.It also destroyed 60% of the uninhabited islands of Java and Samatra

Vesuvius 79 A.D- This volcano killed more than 2 000 people. It also buried the town in more than 15 feet(5 metres) of ash. Most of the people in the town(Pompeii) did not die from the lava but suffocated from the ashes.
Some Facts About Volcanoes
*Volcanic eruptions can send ash high into the air, over 30km (17 miles) above the Earth’s surface

*The sound of an eruption volcano can be quiet and hissing or explosive and booming. The loud cracks travel hundreds of miles and do the most damage, including hearing loss and broken glass

*There are more than 500 active volcanoes in the world. More than half of these volcanoes are part of the "Ring of Fire," a region that encircles the Pacific Ocean.

*The danger area around a volcano covers about a 20-mile radius.
Risks of living near a volcano
Volcanic pollution – While active, a volcano can be a natural source of pollution. Volcanoes release ash, gas, and magma into the air and onto the ground. Which causes Earthquakes and tsunamis – Volcanoes and earthquakes share plates and because of this a volcano can set off an earthquake by creating movement in the plates.
Lava flow – lava flow endangers people, property, and vegetation.
Airborne lava fragments – Erupted piece of magma mostly endangers things and people directly in the vicinity of the volcano but can cause serious damage. Explosive eruptions would spread the danger out farther than just the direct proximity of the volcano.
Volcanoes by Bhavya ,Mustafa and Muhammad Ubaid Hossenbacus.

Types of lava

Mafic lava is dark in colour, high magnesium and iron. This is the flowy type of lava
Felsic lava is light in colour and lighter material such as silcon and fieldspar.
This is a body of a person when they were caught volcano explosion
How to protect yourself from a volcano
You cant protect yourself from the volcanic eruption but you can minimize it by wearing a heat resistant suit
Heat resistant suit
We hope you enjoyed the presentation
Any questions?
As you can see volcanoes
are really deadly and they cant be prevented.We hope you learned something from are awsomely awsome presentation
Full transcript