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Transcript of Mt. Vesuvius
Andesitic magma erupts explosively
High in silica
tends to have high gas content
viscous and therefore traps gas, builds pressure and explosively erupts
both mafic and felsic lava
Descending lithosphere releases water into the surrounding mantle
Sub ducting lithosphere releases water into the mantle and the overlaying crust
The water lowers the melting temperature of the rock
The rock melts
Magma forms and erupts and forms the volcano
Melting Rock Process
Type of Magma: Basaltic
Basaltic lava contains less than about 52 percent silica (SiO2) by weight.
Basaltic lava flows easily
Low viscosity (low gas content)
Mafic lava- contains iron and magnesium
Pahoehoe lava – runny and not sticky
By: Karina F. Ashley R. Amy S.
Volcanic ash made "shell" around bodies
African Plate being pushed under the Eurasian Plate
The heated crust material melts into mama
Magma is less dense than the surrounding rock, and is pushed upward to form a volcano
Composite or strato volcano
Formed at a convergent boundary
Near Naples, Italy
Soil mixes with volcanic ash over millions of years and becomes very fertile
Increase of land
Geothermal energy production
Volcanic rocks used to make any products
Loss of human life
Completely destroyed/covered cities Pompeii, Stabiae, Herculaneum in 79 A.D. – killed about 16,000 people
1944, destroyed 4 villages