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AMS Volcanism

TermDefinition
Volcanism All the processes associated with the release of magma, hot fluids and gases
Zones of Volcanism Places where magma is released such as ocean ridges, volcanic islands and volcanic mountain ranges
Convergent Volcanism Volcanic activity created when an oceanic plate melts under another plate during subduction
Divergent (rift) Volcanism Volcanic activity created when two tectonic plates move apart and magma rises to fill the gap
Hot Spot Volcanism Volcanic activity created when ONE tectonic plate moves over a stationary (does not move), unusually hot, place in Earth’s mantle
Stationary Does not move; stays in the same place
Explosivity/Explosiveness The ability to burst with violence; in a volcano - quiet/oozing or violent/exploding
Viscosity A physical property that describes a material’s resistance to flow/movement
Resistance Slow to act or move; hesitant
Chemical Composition The elements and/or compounds that make up a material; what something is made of
Silica Content The amount of silicon and oxygen found in magma; more silica = high viscosity = violent eruptions
Basaltic Magma Magma created when rock from Earth’s upper mantle or oceanic crust melts
Andesitic Magma Magma with more silica; silica gained by passing through an oceanic or continental plate; will create a more forceful eruption
Rhyolitic Magma Magma with a high amount of silica; silica gained by passing through thicker oceanic or continental plates; creates the most violent eruptions
Convection The process that transfers heat energy from warmer regions to cooler regions. Convection occurs in Earth’s mantle
Thermal Energy Heat
Effusion of Lava A quiet, non-violent eruption of magma; a flow, discharge, or slow ooze of magma; like at ocean ridges or hot spot volcanoes
Explosion of Lava A violent eruption of magma, ash, tephra (rocks) and gases
Created by: dianabowman