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Earth Science. Coach Williams Room 310B. Chapter 18. Volcanoes. Section 18.3: Volcanoes. Objectives: Describe the major parts of a volcano. Compare/contrast shield, cinder-cone, and composite volcanoes. Contrast the volcanism that occurs at plate boundaries.

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earth science

Earth Science

Coach Williams

Room 310B

chapter 18
Chapter18
  • Volcanoes
section 18 3 volcanoes
Section18.3: Volcanoes
  • Objectives:
    • Describe the major parts of a volcano.
    • Compare/contrast shield, cinder-cone, and composite volcanoes.
    • Contrast the volcanism that occurs at plate boundaries.
    • Explain the relationship between volcanism and hot spots.
anatomy of a volcano
Anatomy of a Volcano
  • Volcano: mountain of cooled lava
  • Vent: opening in crust
  • Crater: bowl shaped depression
  • Calderas: larger depressions
types of volcanoes
Types of Volcanoes
  • Shield: broad, gentle slope. Circular base
  • Cinder-Cone: steep sides. Smaller
  • Composite: fragments layered with lava.
    • Larger
volcanic materials
Volcanic Materials
  • Tephra: rock fragments thrown in air
    • Dust: <2mm
    • Ash: >2mm
    • Lapilli “little stones”: rock size
    • Volcanic blocks: large, angular
    • Volcanic bombs: large rounded
  • Pyroclastic flows: deadly flow of volcanic material (gas, ash, tephra)
where volcanoes occur
Where Volcanoes Occur
  • Most at plate boundaries
  • 80%: convergent boundaries
  • 15%: divergent boundaries
  • Hot spots: hot regions of Earth’s mantle
    • Volcanoes far from plate boundaries
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