Volcanoes.

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Presentation transcript:

Volcanoes

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

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

3. Crater- the top of the volcano. It is a funnel shaped pit 3. Crater- the top of the volcano. It is a funnel shaped pit. It is formed when the material explodes out of the vent!

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

Shield Volcano Wide and somewhat flat. It forms from a quiet eruption. Lava flows out quietly and for great distances.

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

Composite Volcano Form from explosive eruptions. Produce a lot of lava and ash. Is small, with steep sides.

Ring of Fire The area around the Pacific Ocean is called the “Ring of Fire” because of the amount of active volcanoes

Complete the following in your notebook… Think about what happens when volcanoes erupt… Explain: What rock type is formed. What type of landform can result. How do volcanoes affect the topography of Earth? Explain: What is the Ring of Fire?