Most Types Of Volcanoes Are Shield Volcanoes, Scoria Cones ( Cinder Cones )

Volcanos are deadly, can form on islands or mainland, and can destroy mountains and cities. Volcanos commonly form from holes in the earth containing magma. When pressure builds up in these magma chambers, they explode resulting in magma and rock catapulting out into the air. As these volcanoes repeatedly explode, they leak magma, which runs down the side of the volcano. Eventually, the lava cools and transforms into solid rock, building up the volcano to mountain size. An example of giant volcanic eruptions is the Pompeii disaster in 79AD, when Mount Vesuvius erupted and destroyed all of Pompeii. Another example includes, the 1980 eruption of Mount St. Helens in Washington state, which destroyed the whole mountain. Volcanos

Mount Saint Helens, located in the Cascade Volcanic Arc, is known to be one of the most deadliest and disruptive volcanic eruptions in recent history. It has a height of roughly 8,300 feet and is a stratovolcano. A stratovolcano is essentially a steep sided peak volcano that is very high in viscosity and contains large traces of volatiles, and additionally are large in nature. (Abbott). On May 18th, 1980, a 5.0 earthquake triggered a massive landslide which basically caused a side of the northern flank to fall down the summit. The blast destroyed nearly 230 miles of land and is claimed to

Anpother factor that can have an impact on the level of hazard posed by a volcano is the type of plate margin on which it occurs. Volcanoes occuring at constructive plate boundaries are usually much less violent than those occuring at destructive plate boundaries. This is because the magma produced by plates moving apart is Basic, and therefoe has a low viscosity, allowing it to flow easily. The lava is produced from a central vent or fissure and erupts regularly but not usually violently. Also,constructive plate boundaries are often found under the sea and create submarine volcanoes, such as along the Mid-Atalntic ridge, so pose few threats to humans. As a result, the hazards posed by volcanoes at constructive plat eboundaries is relatively low. However, the subduction of one plate under another at destrctive plat eboundaries can form an acidic magma chamber, due to the build up of intense heat. Acidic magma is very viscous and resisitant to flow, meaning that there is often a huge build up of pressure, which can result in very violent and dangerous eruptions involving ash and pyroclastic flow. This can pose a a serious hazard. Pyroclastic flowsa are extremely dense, containing toxic gases at very high temperatures, and can move at speeds over 100km/h. The consequences of such an unpredictable hazard can be extremely seruous

Volcanoes are one of the most destructive, yet, most beautiful things on Earth. They can make a famous city choke in its own ashes in one day, like Pompeii. Or they can turn a once damaging mountain into a graceful and peaceful home for new life, like Mount St. Helen’s. All volcanoes are unique, and no two are the same. Some erupt differently than others, some look different than others, and all are located in different spots all over the world. I learned this while completing the project and the five volcanoes I researched are examples of my discoveries. The five volcanoes I researched were Mount Hood, Mount Mageik, Long Island, Mount Muria, and Las Pilas.

Feel free to stretch, it's been a long ride. We will be stopping by a restaurant later to get some lunch. In front of you, you can see Humphreys Peak, the tallest mountain in the San Francisco Peaks. The San Francisco Peaks is actually a volcanic mountain range and is part of the San Francisco volcanic field. The peaks were once a stratovolcano but is now eroded and are the remains of the volcano. It is the only stratovolcano in the San Francisco Volcanic Field. The tallest mountain, Humphreys Peak, is about twelve thousand, six hundred and thirty-three feet in elevation, which is also three thousand, eight hundred and fifty-one meters tall. In fact, Humphreys Peak is the tallest point in all of Arizona. Also in this area, are more than six hundred volcanoes. Most of the volcanoes found here are basalt cinder cones. These volcanoes are relatively small. They are also usually less than one thousand feet in elevation. Another fact about these basalt cinder cones is that they are formed within a range of a couple of months to a couple of years. The San Francisco Volcanic Field also has several lava domes. Lava domes are formed by dacite and rhyolite magmas. Both of those types of magma are very rich and high in silica. So, as a result, the dacite and rhyolite magmas are very viscous and thick. As a matter of fact, the magmas are so viscous is thick that when volcanoes erupt, the magma tends to pile up and form very steep sided masses, which are the domes.

The active volcano that I chose to research is Popocatepetl volcano. Popocatepetl volcano is an active volcano located in Mexico. The volcano is oftentimes referred to as “El Popo” by many Mexicans. El Popo is a composite cone volcano. Being a composite cone volcano, El Popo is characterized by a steep cone shape, which was created by many composite layers of material pouring out over numerous eruptions. The lava that comes out of El Popo is extremely viscous. The highly viscous lava does not travel very far, and typically cools down rapidly. Scientists believe that El Popo is about 730,000 years old. It has erupted more than 15 times since 1519. In 1994 El Popo produced gas and ash, which caused nearby towns to evacuate. The toxic

There are many different types of volcanoes in the United States. Composite, Ciner and Shield are the three types of volcanoes. Over the history of Hawaii, covering about 85 million years, there have been 129 volcanoes formed due to the hot spot and of that 129, 123 of them are extinct or seamounts. In Hawaii today, there are currently five active volcanoes, Lo'ihi, Kilauea, Mauna Loa, Hualalai and Haleakala. Lo'ihi is the only underwater volcano in Hawaii; the other four volcanoes are above sea level. Kilauea is a hyperactive shield type volcano. Volcanoes are mainly found where tectonic plates are diverging or converging. The Mid Ocean Ridge is an example of divergent tectonic plates pulling apart, where the Ring of Fire is an example of convergent tectonic plates pushing together. Hawaii today is comprised of many different volcanoes with several different volcano types.

A Volcano is a mountain or hill that has a crater running through it filled with lava, rocks, gas and hot vapour that will erupt. There are three types of volcanoes, there is the Cinder Cone volcano which is the smallest, the Shield volcano which is in most cases the biggest and the Composite volcano which can be the most deadly.

Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.

Laki was formed from a hot spot which is where molten rock reaches into earth's crust. The volcano erupted with over 140 separate volcano vents. Laki is a shield volcano which is created entirely of lava, it is sloped, and large. Laki’s elevation

The different types of eruptions that come from the volcanoes that stretch across Io play a significant role in its volcanology. There are three popular types of eruptions that occur on Io. These are: flow dominated, explosion dominated, and Intra-patera eruptions. Flow dominated eruptions “produce extensive compound lava flow fields… similar to compound inflationary flows commonly observed on Hawaiian eruptions on Earth” (Lopes 2015). These flows make up a major terrain type on Io. Many of the major flows are produced by build ups of small breakouts of lava on top of older flows. They differ from the other popular eruptions because they can last for years, have a low output of energy, and can have flow fields larger than 300 kilometers. The opposite of this style of eruption is explosion dominated eruptions. Where “most of the energy of the eruption is directed into a short-lived, vigorous event that lasts days to weeks… can produce extensive pyroclastic deposits and lava flow fields, and typically a large (>200 km high) plume, thought to originate from the interaction of silicate magma with sulfurous volatiles” (Lopes 2015). These eruptions occur when magma deep within Io’s molten mantle reaches the surface and cause alterations in the near-infrared brightness. They also have the potential to cause colossal short lived changes around them. For example, in 1997 an eruption produced a 400 kilometer wide deposit of silicate and sulfur dioxide. The powerful eruption in recorded history was explosion dominated and observed by astronomers on February 22, 2001. The most common of the three eruption types, Intra-patera eruptions, “occur with or without associated plumes, and are thought to be lava lakes” (Lopes 2015). Generally they have flat floors and steep walls. Unlike features that are similar on Earth they are usually not located at the peak of a shield volcano. Their

Volcanic eruptions, in its simplest form, is when molten lava, gasses and ash are released and expelled out of the earth’s mantle from built up pressure. The liquid rock, or magma start to bubble and release gas which creates extreme pressure. A volcanic eruption occurs when the pressure pushes the magma and gasses to a crack or fissure in the surface of the mantle where it explodes out.

A volcano is a vent where magma erupts when the volcano is active. They can be in a variety of shapes, from cone-shaped to craterlike. If a volcano is dormant for 10,000 years it is deemed extinct. But what forces the magma out through the crust? “Volcanoes are just a natural way that Earth and other planets have of cooling off and releasing internal heat and pressure,” explains Oregon State University. Magma is extremely hot and thus not as dense, so it will rise depending on the weight of the rocks around and above it. As it rises, the gas forms bubbles that “exert tremendous pressure,” the University

In the article “Mauna Loa, Hawaii Island” the author states “The western slopes from the Western slopes from Manuka State Park to the entrance to the Kahuka section of the Hawaii volcanoes National State Park feature a forest reserve and broad vistas with sweeping views of the ocean and mountain.This section includes landscape passing over relatively new lava so the traveler can experience transitions from substantially untouched to well vegetated volcanic terrain and rainforest. They say that there are about 50-70 volcanoes that go off every year including the volcano in Italy named Stromboli that has been erupting for over 1,000 years.There are as many as 1500 known and possible volcanoes that have erupted in the past

Some volcanoes happen often but others haven't erupted for a long time. Some volcanoes are found are the Pacific Ocean. Others are found around the Atlantic and Indian Ocean.Volcanoes are mountains that are coned shaped. Magma is made beneath the Earth's crust and extreme pressure makes the magma rise, it breaks through weak spots and comes out of mountains which makes it a volcano. Volcanoes explosive chart is zero to eight. Zero means non explosive and eight means mega colossal.