Volcanoes

  1. Two factors that influence viscosity of lava
    • Temperature of lava relative to it solidification point
    • silica content
  2. Basalt lava has less silica and flow easily
    andesites and rhyolites contain lots of silica and flow sluggish
  3. Shield volcanoes
    broad gently sloping cones made of solidified lava flows
  4. Composite Volcanoes
    • Intermediate steepness¬†
    • composed of alternating layers of pyroclastic material and solidified lava
  5. Dome complexes
    • type of composite volcano¬†
    • high silica content
    • moon-shaped growth resulting form eruption of high-silica lava
  6. Pyroclastic Flows
    very hot, fine-grained ash and lava fragments that travel at hurricane speeds
  7. Lahore
    Volcanic Mud flow
  8. Cinder Cones
    • Constructed from loose rock fragments ejected from the central vent
    • steep-sided with slopes of 30 degrees
    • dust and ash
Author
jo73
ID
311642
Card Set
Volcanoes
Description
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