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Three Types of Volcanoes. Shield Volcanoes. Low silica level Low viscosity Lava High or low levels of gas Flattened mound Resembles a warrior’s shield. Mauna Loa, Hawaii. Piton de la Fournaise. Surtsey, Finland. Composite Volcanoes. High in silica High viscosity magma

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shield volcanoes
Shield Volcanoes
  • Low silica level
  • Low viscosity Lava
  • High or low levels of gas
  • Flattened mound
  • Resembles a warrior’s shield
composite volcanoes
Composite Volcanoes
  • High in silica
  • High viscosity magma
  • High levels of gas
  • Highly explosive
  • Cone shaped
  • Formed by layers of lava and ash
cindercones
Cindercones
  • Low silica lava
  • High levels of gas
  • “Fire-fountain” eruptions
  • Commonly found on the flanks of shield volcanoes
  • Made from a pile of rock pieces
  • Structurally weak
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