Monday, November 30, 2009

TYPES OF VOLCANOES


The foundation of our unit, literally, is the structure of volcanoes. It is imperative to be able to distinguish the four main types of volcanoes. Here I have them grouped by the different subcategories, which makes it easier to compare volcanoes

STRUCTURE:
Shield-quietly sloping, domeshaped mountain
Cinder Cone-narrow base and steep sides
Stratovolcano-large coneshaped mountain
Caldera-composite with a collapsed crater

ERUPTION:
Shield-quiet lava flows
Cinder Cone-explosive eruptions
Stratovolcano-explosive eruptions
Caldera-most explosive

COMPOSITION:
Shield-basaltic
Cinder Cone-pyroclastic material
Stratovolcano-layers of rock particles
Caldera-layers of rock particles

EXAMPLE:
Shield-Mauna Loa, Hawaii
Cinder Cone-Paracutin, Mexico
Stratovolcano-Mt. Vesuvius, Italy
Caldera-Yellowstone Caldera, Wyoming


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