A volcano is an opening in the earth ’s surface through which lava‚ hot gases‚ and rock fragments erupt. These openings are formed when melted rock from deep in the earth build up around the opening‚ and form mountains. When these openings erupt they shoot out huge fiery clouds over the mountain‚ and spew glowing rivers of melted lava down their sides. In some eruptions‚ red-hot ash and cinders shoot out the mountaintop‚ and large chunks of hot rock are blasted high into the air. Only a few spectacular
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A stratovolcano is a tall‚ steep-sloped‚ nearly symmetrical volcanic structure. Its andesitic lava is mainly deposited from one enormous central vent. Typically‚ stratovolcanoes are the most violent type of volcano. Mount Nyiragongo is no exception. Raging fires‚ fierce tremors‚ plumes of smoke‚ and viscous lava flows that can range from one to one-hundred feet wide are all traits of a Mount Nyiragongo eruption. The volcano often spews dust and ash. It
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world. There are three types of volcanoes‚ they are shield volcano‚ cinder cone volcano and a composite volcano. A volcano is a place where ash‚ gases‚ and molten material rock from deep underground erupt to the surface. Lava comes out of a vent ‚ then it turns into a lava flow. When external waters‚ such as groundwater ‚ mixes with magma and then it turns into steam. The violence of an eruption depends on the amount of gas that was dissolved in the magma. Pyroclastics‚ form from when fragments
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Chapter 1: An Introduction to Geology What is geology‚ and what is the difference between physical and historical geology? Geology is the scientific study of the Earth and its major systems Physical Geology is the Study of the Earth’s composition. structure‚ and the processing that shape it Historical Geology is the Study of Earth’s history and the history of life With respect to why we study geology‚ in class I cited three areas of benefit to humanity where geologic knowledge is needed. What
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explosive eruptions sometimes with minor lava flows‚ usually from one or more of the three main summit craters 2. Flank vents with higher lava flow rates – these are less frequently active and originate from fissures that open down from the summit 2001 eruption causes: complex flank eruption where all four summit craters produced spectacular and powerful activity‚ ranging from mild‚ persistent‚ slow (strombolian) activity‚ to high-energy explosive episodes. Lava flowed from all four summit craters as
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as a hill or a mountain that is constructed by the extrusion of lava or rock fragments from a vent (Plummer‚ 2007). A volcano consists of a volcanic cone‚ craters‚ vents‚ necks and fissures within its physical form. But volcanoes have more to them that isn’t seen so easy from a distance‚ volcanoes also consist of magma and lava. Magma is the molten rock and trapped gasses that are found beneath the Earth’s surface. Lava is the molten rock that is found on or above the Earth’s surface
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Volcanoes on a destructive plate margin often lie dormant for years but have explosive and violent eruptions with acidic lava‚ pyroclastic flows and copious amounts of ash. Because of the length of time that they lie dormant prediction isn’t as easy. Montserrat in the Caribbean experienced a violent eruption in the mid 1990’s. The early activity showed signs of a major eruption
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years (rough estimate at best)‚ Mt. Saint Helen’s is the most active volcano of the Cascade Mount Range. With its last eruption between the years of 2004-2008 where 92 million cubic meters erupted from the lava dome. (USGS 2004). There are several hazards associated with Mt. Saint Hellen’s. Lava domes‚ lahars‚ pyroclastic flows‚
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Im guessing and hoping everyone has probably heard this saying hundreds of times before. Either by friends‚ parents‚ or other relatives. Now as cliche as that may sound‚ and probably the hundred more times more you are going to hear this‚ the fact of the matter is it is true. Now im sure‚ everyone in this has thought about the end of the world and whether or not the end is near? From the issue of global warming‚ it being mentioned in religious texts‚ to the conspiracy theory of huge asteroids
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off a mountain‚ scatter fine ash practically all over the globe and hurt rock fragments into the stratosphere to darken the skies a continent away. But the classic eruption – cone-shaped mountain‚ big bang‚ mushroom cloud and surges of molten lava – is only a tiny part of a global story. Volcanism‚ the name given to volcanic processes‚ really has shaped the world. Eruptions have rifted continents‚ raised mountain chains‚ constructed islands and shaped the topography of the earth. The entire
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