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Information about volcanoes

treana Morton

on 23 April 2010

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Transcript of Volcanoes

VOLCANOES What are they? A volcano is a landform (usually a mountain) where liquid rock (Molten rock) erupts through the surface of the planet. What are the three layers the Earth is made of? 1 Crust
The crust is the outer layer of Earth. It is about 29 km thick. It is the part we live on.
2 Mantle
The second layer is called the mantle. It is about 2896 km thick.
3 Core
The inner layer is called the core. Did you know?

Volcanoes are like giant safety valves that release the pressure that builds up inside the Earth. Definitions

Magma - Molten rock beneath Earth's surface.

Vent - An opening in Earth's surface through which volcanic materials escape.

Lava - Molten rock that erupts from a volcano that solidifies as it cools.

Crater - Mouth of a volcano - surrounds a volcanic vent.

Ash - Fragments of lava or rock smaller than 2 mm in size that are blasted into the air by volcanic explosions.

Ash Cloud - A cloud of ash formed by volcanic explosions. Parts of a volcanoe What is molten Rock? Molten rock is called magma. It is rock that has been melted. molten rock is a mixture of melted rock, solid mineral crystals, and dissolved gases. Volcanoes are essentially vents on the Earth's surface where molten rock, debris, and gases from the planet's interior are emitted.

When thick magma and large amounts of gas build up under the surface, eruptions can be explosive, expelling lava, rocks and ash into the air. Less gas and more thicker magma usually mean a less dramatic eruption, often causing streams of lava to ooze from the vent. www.kilaueaadventure.com/pic-kilauea-cinder-cone.php References:





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