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Volcanoes! PowerPoint PPT Presentation

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Volcanoes!. Everything about volcanoes!. Where?. Volcanoes usually are near the Ring of Fire. Volcanoes are on the North-West of America, Along the coastline of Mexico and South Americ a Bordering the Pacific Ocean. There is a long chain going o ff of the Aleutian Islands in

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Everything about volcanoes!



Volcanoes usually are near the Ring of Fire.

Volcanoes are on the

North-West of America,

Along the coastline of

Mexico and South America

Bordering the Pacific Ocean.

There is a long chain going

off of the Aleutian Islands in


Volcanoes on the Ring of Fire.

Volcanic eruption data

Volcanic Eruption Data

The number of volcanoes has been going down since the beginning of the Earth. This is a chart of volcano activity rates 1875-1993

This is a chart of how many

Volcanoes erupted 1994-2011

Earth s structure

Earth’s structure

The lava that spews out of the crater comes from the mantle. The cone is made of hardened lava that is from the mantle. The magma chamber is from magma in the mantle rising through cracks in the rock until they stop then the magma will become a magma chamber.

Typical occurrence

Typical Occurrence

When pressure builds up in the magma chamber that pushes magma through the volcano's vents. If the volcano doesn't have water near it it will just run out, no explosion at all. If the lava comes in contact with water it will create an explosion. If the lava gets caught in the pipe then the pressure will build up and there will be an explosion.

Drastic measures

Drastic Measures

The most drastic eruption and effects of a volcano is called a supervolcano. These are formed when magma gets to the Earth's surface and stays there until the pressure becomes to great, then the lava explodes out of the crust along with lots of ash, dust, pumice, and gases.

This dust will stay in the atmosphere for 6-12 years depending on how much, blocking out the sun.



The measurement volcanologists use to measure volcanoes is the Volcanic Explosivity Index or VEI.

Key terms

Key terms

  • Magma: molten rock that is lava when it is at the surface.

  • Magma chamber: a chamber of magma under the ground.

  • Pipe: a pipe that connects a magma chamber to a vent.

  • Pumice: Volcanic rock, it has air bubbles and can float on water.

  • Pyroclastic flow: it consists of ash, pumice, rock fragments, and gases created by explosive eruptions.

  • Volcano: a crack where lava, ash, and gases spew out.

  • Ash: small fragments of rock or lava that fly into the air during a volcanic eruption.

  • Basalt: a rock formed from dried lava.

  • Caldera: What is left after the volcanoes summit collapses

After effects

After Effects

Volcanoes will send ash and other particles into the air that water vapor will condensate and will cause more rain. Volcano’s sulfur infuse with water vapor and create sulfuric acid particles that create a haze in the Earth’s atmosphere that lowers the Earth’s temperature for a few years. This will also possibly create acid rain that kills animals in water, kills plants, and lowers human health. Volcano’s lava will form stone on the surface of the Earth.



  • Dust and ash rub together to create static electricity and that creates lightning in the ash when a volcano erupts.

  • Diamonds are found in the pipes that connect the magma chamber to the volcanic vents.


Rowland, Scott. ‘’Volcano.’’

World Book. Vol.20.

Chicago: World Book, 2007

"Volcano." U*X*L Encyclopedia of Weather and Natural Disasters. Vol. 4: Optical Effects to Wildfire. Detroit: UXL, 2008. 587-615. Gale Science In Context. Web.

"Magma chamber." World of Earth Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. Detroit: Gale, 2007. Gale Science In Context. Web.

Image/information: http://en.wikipedia.org/wiki/Pacific_Ring_of_Fire

Image: http://oem.bmj.com/content/63/2/149.extract

Information: http://www.ngdc.noaa.gov/nndc/servlet/ShowDatasets?dataset=102557&search_look=50&display_look=50

Image: http://www.handpen.com/Bio/sun_freaks.html

Information: http://en.wikipedia.org/wiki/Kiyoo_Mogi#Mogi_model

Information: http://en.wikipedia.org/wiki/Stratovolcano

Information: http://volcano.oregonstate.edu/how-big-are-eruptions

Information: http://library.thinkquest.org/17457/volcanoes/erupt.php

Information: http://en.wikipedia.org/wiki/Supervolcano

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