Post on 01-Apr-2015
Three Types of Three Types of VolcanoesVolcanoes
Shield VolcanoesShield Volcanoes
Low silica levelLow silica level Low viscosity LavaLow viscosity Lava High or low levels of gasHigh or low levels of gas Low to medium explosivityLow to medium explosivity Flattened moundFlattened mound Resembles a warrior’s shieldResembles a warrior’s shield
Mauna Loa, HawaiiMauna Loa, Hawaii
Piton de la FournaisePiton de la Fournaise
Surtsey, FinlandSurtsey, Finland
Composite VolcanoesComposite Volcanoes
High in silicaHigh in silica High viscosity magmaHigh viscosity magma High levels of gasHigh levels of gas Highly explosiveHighly explosive Cone shapedCone shaped Formed by layers of lava and ashFormed by layers of lava and ash
Mt. Rainier, WashingtonMt. Rainier, Washington
Mt. Fuji, JapanMt. Fuji, Japan
Mt. St. Helens, WashingtonMt. St. Helens, Washington
CinderconesCindercones
Low silica lavaLow silica lava High levels of gasHigh levels of gas ““Fire-fountain” eruptionsFire-fountain” eruptions Commonly found on the flanks of Commonly found on the flanks of
shield volcanoesshield volcanoes Made from a pile of rock piecesMade from a pile of rock pieces Structurally weakStructurally weak
Pu'u ka Pele, HawaiiPu'u ka Pele, Hawaii(on the flanks of Mauna Loa)(on the flanks of Mauna Loa)
FloreanaFloreana Island, Galapagos Island, Galapagos
Puu OO, HawaiiPuu OO, Hawaii