Three Types of Volcanoes

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Shield Volcano Built of layers of lava by repeated non- explosive eruptions Lava is runny (low viscosity) Has gentle sloping sides Ex: Mauna Kea-tallest.
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Presentation transcript:

Three Types of Volcanoes

Shield Volcanoes Low silica level Low viscosity Lava High or low levels of gas Low to medium explosivity Flattened mound Resembles a warrior’s shield

Mauna Loa, Hawaii

Piton de la Fournaise

Surtsey, Finland

Composite Volcanoes High in silica High viscosity magma High levels of gas Highly explosive Cone shaped Formed by layers of lava and ash

Mt. Rainier, Washington

Mt. Fuji, Japan

Mt. St. Helens, Washington

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

Pu'u ka Pele, Hawaii (on the flanks of Mauna Loa)

Floreana Island, Galapagos

Puu OO, Hawaii

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