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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1616. Its 48th and latest major eruption was a quiet effusion of lava on July 14‚ 2006‚[6] which was aggravated when a lahar caused by the rains of Typhoon Durian followed on November 30‚ 2006. A further summit eruption occurred on August 10‚ 2008.[7] Starting in January 2011‚ the volcano is weakly erupting and may be building up to a larger hazardous eruption. The most destructive eruption of Mayon occurred on February 1‚ 1814. Lava flowed but not as much compared to the 1766 eruption. Instead‚ the
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partial melting of the plate‚ this is similar to composite and calderas as O-O convergence is destructive along with calderas and composite. They tend to have gentle and predictable eruptions which can cause to build up a large amount of flows‚ where the lava is of low viscosity and is basaltic causing it to be 1200°C. Furthermore‚ fissure volcanoes tend to also have gentle and predictable eruptions along with shield volcanoes and are found at constructive margins and rifts. As the North American and Eurasian
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Analyse the factors that cause differences in the hazards caused by volcanoes around the world (40 marks) A hazard is defined as something which has the potential to kill or cause harm. However a hazard is only a risk to people if they are exposed to it. This is when a hazard can cause disasters. For example‚ a volcano is only a hazard if the population comes in contact with the consequences of its activity. Hazards and their likeliness to become disasters can depend on many different factors‚ for
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Alyssa Iferenta A volcano is an opening in the earth’s crust were magma from deep inside the earth forces its way to the surface. Once the volcano erupts the magma is called lava. Volcanic eruptions have positive and negative effects. For example the lava flow can cause complete chaocs and dismantle villages‚ but once the lava decompses it create extermely fertile soil. Volcanic eruptions throughout history have been known to cause mass destruction from lahars. [Refer to figure 1] A lahar is a
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plates. The plates move slowly on a layer called the asthenosphere. Meteorites can tell us what the earth is like-these are rock and metal fragments which fall to earth from space. We know the earth’s core is hot through hot spring geezers and volcano lava. 2 types of crust OCEANIC CRUST: it is found under the oceans; it’s thin and has a low density as it is made from an igneous rock called basalt. It is 6-8 km thick. CONTINENTAL CRUST: this forms the land‚ made from granite which is low density igneous
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surface of the earth through a series of cracks. When it reaches the surface of the earth‚ we refer to it as lava. As layer upon layer of lava builds up‚ a volcano is formed. What affects the forming of volcanoes? There are many factors that determine what kind of lava flow will occur and what type of volcano it will be. The amount of gas trapped in the lava‚ the kinds of minerals making up the lava‚ and how much pressure can be trapped in the area all affect the eruption and formation of the volcano
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Explosive Diamond Cinder Cone‚ Washington County Shield Volcano Very gentle slopes; convex upward (shaped like a warrior’s shield) Large over 10s of kms across fluid lava flows (basalt) Quiet Cedar Hill‚ Box Elder County Strato Volcano Gentle lower slopes‚ but steep upper slopes; concave upward Large 1-10 km in diameter numerous layers of lava and pyroclastics Explosive Mount Belknap‚ Tushar Mountains‚ Paiute County Active Volcanoes A volcano will be classified as an active volcano if at the
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first time in around 9‚400 years on Friday 2nd May. The volcano is a caldera which is situated above a subduction zone where the Pacific Ocean plate is consumed beneath the South American continental crust. The volcano is composed of viscous rhyolitic lavas and pyroclastics and is typical of the magmas rising through the young fold mountains of the Andes. The eruption is said to have been triggered by a string of earthquakes that occurred on 30th April. Here is a diagram showing how Chaitén is located
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surface cracks. When a submarine volcano erupts the result is different -- and usually less dramatic -- than the eruption of a land volcano. Unless the volcano breaks sea level‚ upon an eruption lava immediately comes into contact with ocean water. The water acts to cool the lava and to transform the lava into a solid state as rubble or sand.
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