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Holly Johnston3 Stages of Volcanic Activity Eruption Stage Cooling and Inactive Stage Volcanic activity can range from permanently active to inactive.
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11Holly JohnstonHolly Johnston
VOLCANOVOLCANO
Holly JohnstonHolly Johnston 22
IntroductionIntroduction
• Volcanoes are cone shaped mountains that are created when magma breaks through the Earth’s surface.
Holly JohnstonHolly Johnston 33
Stages of Volcanic ActivityStages of Volcanic Activity
• Eruption Stage• Cooling and Inactive Stage• Volcanic activity can range from
permanently active to inactive.
Holly JohnstonHolly Johnston 44
Types of Volcanoes Types of Volcanoes
• Three main types of volcanoes are:• Cinder Cone• Shield• Composite
Holly JohnstonHolly Johnston 55
Types of Lava Rocks Types of Lava Rocks
• There are two main types of lava rocks• Basalt • Obsidian
Holly JohnstonHolly Johnston 66
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.