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Land Form Patterns: Volcanic Mountains

Land Form Patterns: Volcanic Mountains. Unit 1: Land & Water Forms World Geography 3200/3202. Course Outcomes. In this lesson you will: 1.1.8 Explain what causes a volcano to erupt. (k) 1.1.9 Describe the characteristics of an ash and-cinder cone, a shield cone, and acomposite cone. (k)

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Land Form Patterns: Volcanic Mountains

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  1. Land Form Patterns: Volcanic Mountains Unit 1: Land & Water Forms World Geography 3200/3202

  2. Course Outcomes • In this lesson you will: • 1.1.8 Explain what causes a volcano to erupt. (k) • 1.1.9 Describe the characteristics of an ash and-cinder cone, a shield cone, and acomposite cone. (k) • 1.1.10 Conclude how the location of active volcanoes is related to places where plates meet. (a)

  3. Terminology • Volcano: An opening in the Earth’s crust through which magma, gases, and ash erupt. • Magma: Molten or melted rock found below Earth’s crust. When magma cools to a solid it forms igneous rocks. • Lava: magma that flows at the Earth’s surface. • Ash : Small pieces of lava that are blasted into the air during volcanic eruptions. • Vent: The opening through which the volcanic material flows.

  4. Types of Volcanoes • Ash & Cinder Cone • Shield Cone • Composite Cone

  5. Ash & Cinder Cone • The simplest type of volcano. • Symmetrical shape, steep sides, large crater. A single vent. • Very explosive. Lava is thick and slow flowing, often blocking the vent  Boom!

  6. Shield Cone • Shape is broad and flat. • The volcano is built of lava, which nearly always flows from the vent. • Eruptions are milder / the least explosive.

  7. Composite Cone • Shape is similar to ash and cinder, except it is built of layers of ash, cinder, and lava. • A network of magma vents develop inside, forming mini-volcanoes. • Eruptions can be explosive, followed by periods of quiet activity.

  8. Volcanoes: Review • Which type of volcano is most explosive? Ash & Cinder • Which type of volcano is least explosive? Shield • Which type of volcano is explosive at times and slow flowing lava at times? Composite

  9. Volcanoes: Review • Which type of volcano has the thickest lava? Ash & Cinder • Which type of volcano has the thinnest, most liquid lava? Shield • Which type of volcano often has side vents? Composite • Which type of volcano has the gentlest slope? Shield

  10. Volcanoes: Review • Which type of volcano is steepest? Ash & Cinder • What term is given to the opening of a volcano? Crater • Liquid, fluid, melted rock below the earth's surface is known as: Magma • Liquid, fluid, melted rock that reaches the earth's surface is known as: Lava

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