Mt. Vesuvius has dacitic to rhyolitic lava. Dacitic lava's silica contents are lower than those of rhyolitic lavas. Both dacitic and rhyolitic lavas are viscous and both can cause great destruction.Continue Reading
Dacitic lava is gray or black in color. It contains minerals such as pyroxene, amphibole, feldspar and 63-68 percent silica. The eruption temperature for dacitic lava is 1,500 to 1,800 degrees Fahrenheit. Dacitic to rhyolitic lava is so dangerous because it contains a high amount of crystals.
Mt. Vesuvius erupts according to the Plinian model of eruption. This involves a column of ash as tall as 28 miles being pushed up from the volcano into the stratosphere. An umbrella-shaped cloud of ash forms at the top of the column. The Plinian column can collapse and create fast and destructive volcanic mudflows. These eruptions are also described as explosive, as the volcano produces a mix of gas and solid particles, which cover the territory around the mountain.
Mt. Vesuvius' most famous eruption occurred in 79 A.D, when two Roman towns of Pompeii and Herculaneum, near Naples, were destroyed together with all their inhabitants. Buildings were buried under the layers of mudflows, ash, pumice and volcanic rocks, and became time capsules for historians to study the everyday life in the Roman Empire.Learn more about Volcanoes
Composite volcanoes, also known as stratovolcanoes, are formed by the gradual deposition of alternating layers of volcanic lava and ash. When volcanoes erupt, emitting lava that flows very slowly, the lava cools and hardens, forming conical shaped composite volcanoes after multiple eruptions over a span of hundreds of years.Full Answer >
Volcanoes are vents in the Earth's crust that allow liquid lava from inside the planet to travel to the surface. According to Reference.com, the word "volcano" applies to both the vent and the cylindrical cone the lava forms.Full Answer >
Cinder-cone volcanoes, properly called scoria volcanoes, erupt when expanding gas bubbles drive lava to the volcano's surface. Because of this pressure, the lava fountains are usually very high and vertical. By the time the erupted material lands, it is already cool.Full Answer >
Cinder cone volcanoes generally spew lava dramatically when they erupt, though the eruptions are not particularly dangerous to human populations. Dramatic and beautiful as the eruptions may be, they are quite insignificant in comparison to the eruptions of other types of volcanoes.Full Answer >