Volcanoes

... location slightly and a new cone begins to develop in the flanks of the parent volcano, Mount Shastina on Mount Shasta is an example. Composite volcanoes include Mount Shasta and Mount Lassen in California, Mount Hood in Oregon, Mount St. Helens and Mount Rainier in Washington. (MacDonald, 280, Kane ... volcano where characteristic behavior is similar, hence the use of such terms as "Strombolian," "Vulcanian," "Vesuvian," "Pelean," "Hawaiian," and others. Some volcanoes may exhibit only one characteristic type of eruption during an interval of activity, others may display an entire seque...

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... in 1800-1801, but is likely to erupt again within the next one hundred years. East Maui, or Haleakala, one of the oldest volcanoes, has a long eruptive history and recent activity indicates that the volcano will erupt in the near future. Last but not least, the Loihi ... volcano rumbled to life again and has been active ever since. The Hawaiian volcanoes are called shield volcanoes, which are the largest volcanoes on earth. The Hawaiian shield volcanoes are the most famous examples. Shield volcanoes are large volcanoes that are built almost entirely of fluid lava flows. It has broad sl...

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... use. A little more than 80 percent of the Earth's surface is volcanic in origin, meaning that most of the Earth's surface was formed by volcanoes. Also, magma deposits heat water underground which produces geothermal energy. The word volcano comes from an island off of the coast of Sicily called Vulcano. ... the Roman Gods. They believed that Vulcan forged thunderbolts for Zeus and weapons for Mars on that island. Out of the 550 of the world's active volcanoes, the world's largest active volcano is Mauna Loa, it is one of the Hawaiian islands. The island protrudes around 13,677 feet abo...

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... the rocks. When the pressure of the steam and new lave becomes great, a violent explosion occurs. In order to indicate the relative activity of volcanoes, scientists classify them as active, dominant, or extinct. An active volcano is one that erupts either continually or periodically. A volcano that has been ... or sleeping volcano. A volcano not known to have erupted within modern history is classified as an extinct volcano. There are many different types of volcanoes, and each of them work in different ways. The form of a volcano is determined by the ingredients of the erupting magma...

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... 's water and atmosphere are evolved from the gases produced by volcanic eruptions, helping to proof human beings life. In addition, another advantage of volcanoes to the environment is to provide nutrients to the surrounding soil. Also, volcanic ash, which is a volcanic rock, exploded from a vent ... and "lava- for molten rock that breaks through the Earth's surface. In other words, lava is magma above the ground (Encyclopedia Britannica). Volcanoes erupt because of density and pressure that is generated in its bottom. The lower density of the magma (very hot liquid rock found below ... ...

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... ash; neither can jet engines causing many deaths (Ruzicka). Lahars are volcanically generated mudflows produced by the mixing of ash with rain or melting snow, which is present on many volcanoes. Lahars travel in the valley bottoms much like pyroclastic flows and kill by suffocation or flooding (Ruzicka). Tsunamis can be extremely dangerous also. Tsunamis are giant waves generated either ... from flooding on the coastline. Non-explosive eruptions can also present dangers. Lava flows, which generally move slow mainly cause property damage by setting fire to buildings or forested areas. Vo...

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... dioxide, can accumulate in closed depressions and suffocate people or animals." (Hoblitt) "Most volcanic eruptions are related to the plate tectonic processes. Most of the world's active above-sea volcanoes are located near convergent plate boundaries where subduction is occurring, particularly around the Pacific basin." (Plate Tectonics and People) "Tephra is a general term for fragments of volcanic rock and ... travel hundreds to thousands of kilometers downwind from a volcano." "Igneous Textures: glassy, aphanitic, phaneritic, pegmatitic, porphyritic, vesicular, pyroclastic or fragmen...

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... same way, each volcano has their own differences in areas such as elevation, time and date of eruption, and fatalities. Mount St. Helens, one of the world's most famous composite volcanoes, is located in Washington in the United States of America. After about nine eruptive periods, Mount St. Helens currently stands at approximately 8,363 feet in elevation. This composite volcano is ... on May 18, 1980 at 8:32 (Pacific Daylight Time). Because of the damages and the lives cost, this eruption is known as the most deadly and economically catastrophic event, involving volcanoes in the histor...

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... 's of kilometers depth to the earth's surface, and includes the near vent deposits of eruptions. Geologists have generally grouped volcanoes into four main kinds: cinder cones, composite volcanoes, shield volcanoes, and lava domes. Deep inside Earth, between the molten iron core and the thin crust at the surface, there ... body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt(explode). Extremely high temperature and pressure cause the rock to melt and become liquid rock or magma. When a large bo...

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