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Volcanoes

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by

Elizabeth Harris

on 30 November 2015

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Transcript of Volcanoes

Volcanoes
How are Volcanoes Formed.
Volcanoes are formed when magma from within the Earth's upper layer works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. As time goes volcanoes continue to erupt, and it will get bigger and bigger.
How long does it take to for a volcano to form
Where are the most active volcanoes
The most active volcanoes in the world are Kilauea volcano on Hawaii is the world's most active volcano, followed by Etna in Italy and Piton de la Fournaise on La Réunion island. After that, it is Stromboli, Merapi, Erta Ale, Ol Doinyo Lengai, Unzen, etc.
How do volcanoes erupt
When it's underneath the surface, the molten rock is called magma. When it reaches the surface, it erupts as lava, ash and volcanic rocks. Whenever a volcanic eruption occurs, rocks, lava and ash build up around the top of the volcano where the material blasts out of.
Thank you for watching
How do you know when a volcano isn't going to erupt anymore
No one knows the exact number of volcanoes there is in the world. There are millions of volcanoes that have been active in the whole life of the earth. During the past 10,000 years, there are about 1500 volcanoes on land that are known to have been active, while the larger number of submarine volcanoes is not known.
By Cooper.B and Neil.S
Volcanoes are formed about over 10,000-500,000 by a lot of eruptions by each lava flow covering the one before it. Lava erupts first from cracks on the deep ocean floor.
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