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Chapter 13 Volcanoes.

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Presentation on theme: "Chapter 13 Volcanoes."— Presentation transcript:

1 Chapter 13 Volcanoes

2 Volcanoes Volcanoes – places where magma breaks through onto the surface of the earth Common along plate boundaries

3 Building a Volcano 1. Magma collected in chambers below earth’s surface 2. Pressure build and is pushed through a vent 3. Rock and ash fall around opening 4. Over time a cone is built

4 Many located along subduction zones

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6 Island Arcs Island Arcs – string of volcanic islands

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9 Types of Volcanoes Tall and pointy Small and long Sticky lava
Not sticky lava

10 Types of Volcanoes Composite – tall and pointy Sticky lava
Formed by alternating quiet and explosive eruptions

11 Felsic Lava Rich in light colored silicate material
Cooler and stickier Gases cannot escape

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13 Pyroclastic Material Fragments of rock from an eruption Volcanic Ash
Lapilli – “Little stones” Volcanic Bombs Volcanic Blocks

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20 Types of Volcanoes Shield – long sloping layers Quiet eruptions
Fluid lava

21 Mafic Lava Rich in magnesium and iron Dark Gases are able to escape
Quiet eruptions


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