The Parts of a Volcano. What is a Volcano?  A volcano is a mountain that forms when magma reaches the surface of the Earth.  Magma rises because it.

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The Parts of a Volcano.

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Presentation transcript:

The Parts of a Volcano

What is a Volcano?  A volcano is a mountain that forms when magma reaches the surface of the Earth.  Magma rises because it is less dense than the solid rock around it.

What are the parts of a Volcano?

Structure of an active volcano Sketch and label this diagram in your notes Crater: the depression at the top of a volcano Vent: Location where magma escapes from the volcano. Lava Pipe: Connects the vent to the Magma Chamber Magma Chamber: the source of magma for a volcano

Types of Volcanoes There are 3 types of Volcanoes: Shield Cinder Cone Composite They are classified by how they form.

Shield Volcano Is wide and somewhat flat. It forms from a quiet eruption. Lava flows out quietly and for great distances. Layers of ash and lava Resemble a warriors shield

Cinder Cone Volcano  Has tall, very steep sides.  Has explosive eruptions.  This eruption produces a lot of cinder and ash.  Usually only erupts once After the eruption the volcano never erupts again  because of their short life span these volcanoes are relatively small.

Composite Volcano Composite Cones are formed from alternating layers of ash and lava. - These have the most destructive eruptions

Dormant Volcanoes no longer have a source of magma and do not have a risk of erupting. a. Dormant volcanoes eventually weather and erode and expose the igneous rocks formed by the magma. These rocks are called Plutons.

Lava Necks: The remains of the lava pipe of an ancient volcano. Lava pipes in the Arizona Desert

Batholith: When the main magma chamber stops receiving heat from the earth's interior it becomes a solid igneous rock. Laccoliths: Form when magma fills chambers near the surface, but to the side of a volcano.