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Page 1: 1 Holly Johnston VOLCANO. 2 Introduction Volcanoes are cone shaped mountains that are created when magma breaks through the Earth’s surface

11Holly JohnstonHolly Johnston

VOLCANOVOLCANO

Page 2: 1 Holly Johnston VOLCANO. 2 Introduction Volcanoes are cone shaped mountains that are created when magma breaks through the Earth’s surface

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IntroductionIntroduction

• Volcanoes are cone shaped mountains that are created when magma breaks through the Earth’s surface.

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Stages of Volcanic ActivityStages of Volcanic Activity

• Eruption Stage• Cooling and Inactive Stage• Volcanic activity can range from

permanently active to inactive.

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Types of Volcanoes Types of Volcanoes

• Three main types of volcanoes are:• Cinder Cone• Shield• Composite

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Types of Lava Rocks Types of Lava Rocks

• There are two main types of lava rocks• Basalt • Obsidian

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ConclusionConclusion

• While volcanoes can be explosive and destructive, they are a natural occurrence that should be appreciated and studied

• Volcanoes begin by magma erupting through the Earth’s crust.

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