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Cinder Cone Volcanoes. Gwen Nytes. Composition.

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Presentation Transcript
composition
Composition

The magma in this type of volcano is made of basaltic-andesitic materials. The magma has an intermediate viscosity, so it’s mildly explosive. It also consists of a lot of gases, so when the lava cools and hardens in the air, gas bubbles get trapped inside. The particles fall back down as cinders, and pile around the vent.

formation
Formation
  • Cinder cone volcanoes are made from particles and pieces of hardened lava blown out of the volcano’s single vent.
  • Usually cinder cones are formed in this order:
        • Eruption – gas-charged lava explodes from vent
        • Formation of cone and crater – Lava cools and hardens in the air and fall down as cinders. These particles accumulate, building up and forming the dome. The eruptions occurring create a crater at the top
        • Lava flow – When the lava begins to lose its gas content, it oozes down the side of the volcano as a lava flow
structures
Structures
  • Vent – opening at Earth’s surface
  • Pipe – the passageway that the magma rises through during an eruption
  • Crater – depression at the top of the volcano where materials are released
  • Cone – sides of volcano built of solidified lava, ash, and cinders
compare contrast
Compare & Contrast

Shield Volcanoes

Cinder Cone Volcanoes

Mildly explosive

Intermediate gas level

Intermediate silicate content

Layered structure built from pyroclastic deposits

Made of ash and cinders

  • Thin, flowing lava
    • Low silicate content
    • Low gas content
  • Gentle slope
  • Little pyroclastic material
  • Formed by hardened lava flow
compare contrast1
Compare & Contrast

Composite Volcanoes

Cinder Cone Volcanoes

Smallest volcano

Layered cone of ash and cinders

Mildly explosive

Intermediate gas content

Intermediate silicate content

  • Steep near the top, gentler towards the bottom
  • Layers of pyroclastic material and lava flows
  • Magma has high viscosity – explosive
    • High silicate content
    • High gas content
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