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Volcanoes!

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Ashley Rhodes

on 22 April 2010

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Transcript of Volcanoes!

Volcanoes! What are volcanoes? 1. A cone-shaped mountain or hill created by molten material that rises from the interior of the Earth to the surface.

2. An opening in the Earth's crust from which lava, ash, and hot gases flow or are ejected during an eruption. 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. Fun
Facts http://news.discovery.com/earth/volcano-eruption-iceland-big-pic.html 80% of eruptions occur underwater. These are pictures from the eruption of Iceland's Eyjafjajokull Volcano. April 7th, 2010 Aurora Full Moon The name "volcano" has its origin from the name of Vulcan, a god of fire in Roman mythology. Fresh lava ranges from 1,300° to 2,200° F The Earth's crust is made up of huge slabs called plates, which fit together like a jigsaw puzzle. These plates sometimes move.

Between the Earth's crust and the mantle is a substance called magma which is made of rock and gases.

When two plates collide, one section slides on top of the other, the one beneath is pushed down. Magma is squeezed up between two plates. What causes an eruption? http://www.woodlands-junior.kent.sch.uk/Homework/mountains/volcanoes.htm
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