Composition of stratovolcanoesStratovolcanoes are typically composed of layers of pyroclastic material. Eruptions of statovolcanoesStratovolcanoes erupt less frequently than shield volcanoes which have formed over hot spots. 79 AD Vesuvius eruptionThe Vesuvius eruption that destroyed the towns of Pompeii and Herculaneum occurred in 79 AD. Stratovolcanoes, or composite volcanoes, are similar to cinder cone volcanoes in terms of their shape, but that is one of their few similarities.
Despite their general shape, there are some variations within stratovolcanoes due to various composition and types of eruptions.
These volcanoes generally take between tens of thousands and several hundred thousand years to form. Stratovolcanoes are one of the most deadly types of volcanoes and their most common type of eruption is Plinian, which is highly explosive and dangerous. Mount Rainier is the tallest peak of the Cascade Range and measures in at an elevation of 4,392 meters. The lava is less fluid and often erupts with explosive eruptions that produce deadly pyroclastic flows.
Stone winds travel down the slopes of volcanoes at hurricane speeds with superheated gases.


In the north on the east side is the Eurasian Plate and on the west side is the North American Plate. These volcanoes have gentle lower slopes but much steeper upper slopes, creating an upwardly concave cone and generally have many distinct vents.
For example some of these volcanoes may have features such as calderas or amphitheaters due to past lateral blasts, such as you can see with Mount St.
These eruptions will generally produce pyroclastic flows containing toxic gases and hot volcanic fragments that move at very fast speeds. This stratovolcano is made up of a younger volcano that developed on top of an older one whose upper area collapsed around 150,000 years ago. Although Mount Rainier itself has developed within the last half a million years, between one and two million years ago there was a similar cone in its place. In fact, these eruptions were so violently explosive that they are one of the largest in the entirety of recorded history. Andesite, dacite and rhyolite lavas erupted by these volcanoes have a high percentage of quartz and feldspar minerals.Minerals in lavasThe minerals in these lavas can be highly explosive because the gases in the magma cannot easily escape. Krakatoa eruptionThe eruptions of Krakatoa in 1883, Mount Saint Helens in 1980 and Mount Pinatubo in 1992 were examples of large volcanic eruptions by stratovolcanoes. Stratovolcanoes can erupt any variety of magma types with levels of basalt, andesite, dacite or rhyolite, but most of the time the lava cools and then hardens before it spreads very far, meaning that they will generally have a narrower base than other types, such as shield volcanoes.


Close to it, also in the Chilean Andes, is Llullaillaco which is the tallest volcano to have eruptions in recorded history, measuring 6,739 meters. The large release of energy from its eruption caused tsunamis which in turn took the lives of 36,400 people on Sumatra and Java. When the volcano erupted, the global temperatures dropped around three degrees Celsius, which is no surprise as ash was ejected 50 kilometers into the atmosphere. Unlike several other types of volcanoes, a stratovolcano usually has a large rest between eruptions. This stratovolcano is most well-known for its eruption in 1980 which killed 57 people in addition to destroying 185 miles of highway, 15 miles of railways, 47 bridges and 250 homes. Because the stratovolcano erupted so much material, it caved in after the eruption was complete and in the process created a caldera that is large enough to be visible from space.
Sometimes the lavas form small dome volcanoes over the vent in the crater of a stratovolcano or on its steep sides. There is a possibility that the volcano emitted a small bit of ash in 1993 which would make it historically active and the tallest historically active volcano instead of Llullaillaco.



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