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

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Presentation transcript:

The Parts of a Volcano

What is a Volcano?  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? 1.VENT- an opening from which lava flows. Dust, ash, and rock particles can also be thrown out of the vent!

2. Crater- the top of the volcano. It is a funnel shaped pit. It is formed when the material explodes out of the vent!

3. Volcanic cone- is the pile of lava, dust, ashes, and rock around the vent. It can be found in different shapes!

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. Ex: Hawaii

Mauna Kea, Hawaii

Cinder Cone Volcano  Has tall, very steep sides.  Has explosive eruptions.  This eruption produces a lot of cinder and ash.

Paricutin in Mexico

Composite Volcano (Stratovolcano)  Form from explosive eruptions.  Produce a lot of lava and ash.  Is large, with steep sides.

St. Augustine volcano, Alaska.

Pyro- Clastic Flows -a fast-moving current of superheated gas (which can reach temperatures of about 1,000 °C (1,830 °F) and rock which reaches speeds moving away from a volcano of up to 450 mph.

1993 Plinian eruption of Lascar volcano, Chile

Viscosity Viscosity  resistance to flow –A high Viscosity means the substance is very thick, like Honey and won't flow easily. –Water has a low viscosity; it will flow easily.

Gas and Silica Content Small amounts of dissolved gas and silica= quiet eruption Large amounts of dissolved gas and silica = explosive eruption.