September 26, 2013 Lesson on: Volcanoes Learning: To describe the key features of a volcano.
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September 26, 2013Lesson on: Volcanoes
Learning: 1. To describe the key features of a
volcano. 2. To identify the differences in
volcanoes.
Dwight Sutherland 2012
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What exactly is a volcano?
KeywordVolcano: A cone shape mountain or hill through which lava, ash and gas may be ejected.
Word clue. Use these words to help• Cone • Lava• Ash • Ejected
Dwight Sutherland 2012
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Lahars
Dwight Sutherland 2012
Lahars – A mixture of lava and soil that flows down a volcano.
Pyroclastic flow – Gases from the volcano mixed with ash and water vapour that flows down a volcano.
OPTIONAL TASK: Write the meaning of the different features of a volcano.
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OPTIONAL TASK: Label the diagram below to show the main features of a volcano.
Dwight Sutherland 2012
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Volcanoes are located in different places.
TASK: How are these volcanoesdifferent? Use the images to help you explain.
A
BSea
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Example: Some volcanoes are located on land. When they erupt they make mountains higher.
Other volcanoes are at sea. When they erupt they form islands.
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Volcanoes form at different plate boundaries. They form at destructive and constructive boundary)
TASK: How are volcanoes formed differently? Use the diagrams below to explain.
Destructive Plate boundary
Constructive Plate Boundary
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Shield
Composite
Volcanic cone is the shape of the volcano hill. Volcanic cones are different. TASK: How are volcanic cones below different? Use the diagrams below to explain.
Dwight Sutherland 2012
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Volcanoes pass through different life stages. TASK: How are volcano life stages different? Use sources below to explain.
A volcano that erupted in recent times. A young volcano with a growing magma chamber.
A volcano that has not erupted in the last 2000 years. It has a large magma chamber. It’s sleeping.
A volcano that has not erupted in a long time and will never erupt again. It’s dead. It’s magma chamber is empty. It looks more like a mountain with plants and animals than a volcano.
Active Dormant
Extinct
Dwight Sutherland 2012
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Volcanoes eject different lava.TASK: How are lavas different below? Use the images below to explain.
Dwight Sutherland 2012
Runny lavaViscous (sticky) lava
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Not all volcanoes have big explosions. Volcanic eruptions are different.TASK: How are volcanic eruptions different? Use the facts below to explain.
Volcanic explosivity Index (VEI): The measurement of how explosive a volcano eruption is.• 0 No explosion• 1 Low explosion• 2• 3• 4• 5• 6• 7• 8 High explosion
Dwight Sutherland 2012
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Recap TASK: Finish the statements below. Volcanoes are different by:
• Their magma type (the material that they are made of). Example viscous (sticky) versus runny (liquid) lava.
• Their location. Example some are on land others are in the sea.
• Their f… • Their l… s…• Their v… c…• Their e… index
Dwight Sutherland 2012
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Recap TASK: Finish the statements below. Volcanoes are different by:
• Their magma type (the material that they are made of). Example viscous (sticky) versus runny lava.
• Their location. Example some are on land others are in the sea.
• Their formation. Example constructive versus destructive boundaries.
• Their life stage. Example active, dormant and extinct.• Their volcanic cones. Example shield versus
composite.• Their eruption index.
Dwight Sutherland 2012
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More challenging Recap TASK: Finish the statements below. Volcanoes are different by:
• Their magma type (the material that they are made of). Example viscous (sticky) versus runny lava.
• Their location. Example some are on land others are in the sea.
• Their formation • Their life stage• Their volcanic cones• Their eruption
Dwight Sutherland 2012