The two major types of volcanoes in the world

The three main types of volcanoes are:

The two major types of volcanoes in the world

Stratovolcano Stratovolcanoes or composite volcanoes are tall conical mountains composed of lava flows and other ejecta in alternate layers, the strata that gives rise to the name. Stratovolcanoes are also known as composite volcanoes because they are created from multiple structures during different kinds of eruptions.

Cinders and ash pile on top of each other, lava flows on top of the ash, where it cools and hardens, and then the process repeats. Throughout recorded historyash produced by the explosive eruption of stratovolcanoes has posed the greatest volcanic hazard to civilizations. Not only do stratovolcanoes have greater pressure buildup from the underlying lava flow than shield volcanoes, but their fissure vents and monogenetic volcanic fields volcanic cones also have more powerful eruptions because they are often under extension.

Big bombs can measure more than 4 feet 1. List of largest volcanic eruptions A supervolcano usually has a large caldera and can produce devastation on an enormous, sometimes continental, scale. Such volcanoes are able to severely cool global temperatures for many years after the eruption due to the huge volumes of sulfur and ash released into the atmosphere.

They are the most dangerous type of volcano. Because of the enormous area they may cover, supervolcanoes are hard to identify centuries after an eruption.

Similarly, large igneous provinces are also considered supervolcanoes because of the vast amount of basalt lava erupted even though the lava flow is non-explosive. Underwater volcanoes See also: Subaqueous volcano Submarine volcanoes are common features of the ocean floor.

Pillow lava is a common eruptive product of submarine volcanoes and is characterized by thick sequences of discontinuous pillow-shaped masses which form under water.

Even large submarine eruptions may not disturb the ocean surface due to the rapid cooling effect and increased buoyancy of water as compared to air which often causes volcanic vents to form steep pillars on the ocean floor. Hydrothermal vents are common near these volcanoes, and some support peculiar ecosystems based on dissolved minerals.

Over time, the formations created by submarine volcanoes may become so large that they break the ocean surface as new islands or floating pumice rafts. Subglacial volcanoes Main article: Subglacial volcano Subglacial volcanoes develop underneath icecaps.

Eruption Styles | Volcano World | Oregon State University

They are made up of flat lava which flows at the top of extensive pillow lavas and palagonite. When the icecap melts, the lava on top collapses, leaving a flat-topped mountain.

These volcanoes are also called table mountainstuyasor uncommonly mobergs. Very good examples of this type of volcano can be seen in Iceland, however, there are also tuyas in British Columbia.The types of volcanoes are differentiated based on their size, composition and explosive style.

In fact, we could compare the different types of . The last major eruption was in , but the lava lakes are in constant flow year-round. This post was written by Alex Robinson and originally appeared under the title The world's most active volcanoes at Thrillist, a Matador syndication partner.

Kilauea is considered one of the worlds most frequently active volcanoes. If you just look at the number of Kilauea eruptions recorded since Europeans arrived, there have been 62 eruptions in years, which comes out to 1 eruption every years.

USGS: Volcano Hazards Program

There are two predominant types of volcanic eruptions: Effusive eruptions – magma rises through the surface and flows out of the volcano as a viscous liquid called lava. Explosive eruptions – magma is torn apart as it rises and reaches the surface in pieces known as pyroclasts.

Top 10 Famous Volcanoes After years of dormancy, Indonesia's Mount Sinabung has woken up from its slumber with an eruption that has already displaced 30, people.

The two major types of volcanoes in the world

TIME takes a look at other well-known volcanoes and the destruction they caused. Some of the largest volcanoes in the world are shield volcanoes. In northern California and Oregon, many shield volcanoes have diameters of 3 or 4 miles and heights of 1, to 2, feet.

The Hawaiian Islands are composed of linear chains of these volcanoes including Kilauea and Mauna Loa on the island of Hawaii-- two of the world's most.

BBC Bitesize - GCSE Geography - Volcanoes - AQA - Revision 4