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Volcano types

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  • 1. Main Idea: Types of Volcanoes
  • 2. A. How does a Shield volcano form?
    • They form when layers of lava accumulate over time.
    • The eruptions are slow and nonexplosive.
    • Shield volcanoes are the largest in size.
  • 3. B. How does a Cinder-Cone volcano form?
    • They form when lava is ejected high into the air and piles up around the vent.
    • Small in size less than 500 m high.
    • More explosive than shield volcanoes, because magma contains more water and silica.
    • Magma is more viscous, which leads to more gas
  • 4. C. How do Composite-Cone volcanoes form?
    • These volcanoes form when layers of lava alternate with layers of volcanic fragments (ash, tephra).
    • Larger than cinder-cone
    • Are the most dangerous of all volcanoes
  • 5. D. Where on earth can volcanoes be found?
    • Volcanoes are found along plate boundaries.
    • 80 % on convergent boundaries
    • 15 % on divergent boundaries
    • 5 % occur away from plate boundaries
  • 6. E. Hot spots
    • Areas on Earth’s mantle where high temperature causes sections of earth to rise (Hawaii).
    • The heat melts the rock, which is forced to the surface as magma.
    • The magma melts the crust forming volcanoes.