Occur when an elongated crack in the crust allows lava to spill out over a large area. Found at consecutive margins, basaltic rocks, gentle and persistent eruption.
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Shield Volcanoes
Form gently sloping cones from layers of less viscous lava. Hotspots and where oceanic crust meets oceanic crust. Basaltic rock, gentle and predictable eruptions.
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Calderas
Build up of gases becomes extreme - huge explosion. Destructive margins and hotspots, rhyolite rocks, explosive as pressure builds up, removes top leaving an opening several km wide.
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Cinder Cone
Small cones when ash and cinder has built into a symmetrical cone. Volcanic bombs ejected from crater, basaltic and andesitic material, viscous lava - short and thick flows.
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Composite Volcanoes
Classic pyramid shaped volcanoes, destructive margins on land, andesitic rocks, explosive eruption and subsequent layers of lava and ash.
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Acid or Dome Volcanoes
Steep sided volcanoes formed from very viscous lava. Lava cannot travel far and builds up a convex cone shape. Destructive margins, rhyolite rocks, explosive eruption as pressure builds up in a blocked vent.
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Other cards in this set
Card 2
Front
Form gently sloping cones from layers of less viscous lava. Hotspots and where oceanic crust meets oceanic crust. Basaltic rock, gentle and predictable eruptions.
Back
Shield Volcanoes
Card 3
Front
Build up of gases becomes extreme - huge explosion. Destructive margins and hotspots, rhyolite rocks, explosive as pressure builds up, removes top leaving an opening several km wide.
Back
Card 4
Front
Small cones when ash and cinder has built into a symmetrical cone. Volcanic bombs ejected from crater, basaltic and andesitic material, viscous lava - short and thick flows.
Back
Card 5
Front
Classic pyramid shaped volcanoes, destructive margins on land, andesitic rocks, explosive eruption and subsequent layers of lava and ash.
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