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VOLCANO
Holly Johnston
1
Introduction
• Volcanoes are cone shaped mountains
that are created when magma breaks
through the Earth’s surface.
Holly Johnston
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Stages of Volcanic Activity
• Eruption Stage
• Cooling and Inactive Stage
• Volcanic activity can range from
permanently active to inactive.
Holly Johnston
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Types of Volcanoes
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Three main types of volcanoes are:
Cinder Cone
Shield
Composite
Holly Johnston
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Types of Lava Rocks
• There are two main types of lava rocks
• Basalt
• Obsidian
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Conclusion
• 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.
Holly Johnston
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