VulcanicityVolcanoes mostly occur at plate margins. They can also occur at hot spots and in rift valleys. The most active volcanic zone is the Pacific Ring of Fire around the Pacific plate. Here plates are colliding or separating. At active points on these plates volcanic mountains are formed‚ e.g. Nazca Plate and South American Plate‚ where plates separate‚ e.g. Pacific and Nazca Plate and in rift valleys‚ e.g. African Plate‚ Kenya. The most active area on the globe is the western rim of the Pacific
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WRITE A TWO PAGE DISCUSSION ON VULCANICITY IN EAST AFRICA. SS/BSS/09/0069 11/24/2010 GEO 211 | Vulcanicity comprises of all the processes through which emissions of magma‚ rock fragments called pyroclaitics and gases are released through openings in the earth’s crust. Most volcanoes appear to be explosive in nature and produce more pyroclastics than lava. The common types of vulcanoes are shield‚ conical and composite volcanoes. Basically‚ vulanicity in Eastern Africa can be categorized into
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Intrusive and minor extrusive features of vulcanicity Intrusive: Batholith: A large emplacement of igneous plutonic rock‚ formed by magma cooling deep in the Earth’s crust. Buoyant magma pushes up through the country rock‚ partially melting it‚ and then cools. A good example is the Cornubian batholith in south-west England‚ which has broken through the surface to form the well-known granite structures of Dartmoor and Bodmin moor‚ among others. Sill: A tabular sheet intrusion where magma has
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magma is released. Magma then extrudes out of the crust along the cracks to the earth’s surface. It results in vulcanicity. Magma cools and solidifies to form igneous rocks when rises nearer to or above the earth surface. During the cooling process‚ crystallization takes place in magma or lava forming minerals. The accumulation of minerals forms igneous rock. When the processes of vulcanicity‚ cooling and solidification of magma take place in the crust‚ the rocks formed are called intrusive igneous
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evidence‚ however it took further research and evidence for this to become a leading theory. This means that although volcanic and seismic events help to prove the plate tectonics theory valid‚ there is also a range of other factors involved. Vulcanicity is the surface presence of Magma within the Earth’s crust. Whereas seismicity is where the
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of sedimentary rocks up‚ resulting in folding. Folding and uplifting take place at the same time. These rocks are folded up above sea level‚ and subsequently form high fold mountains‚ as in this case‚ the Andes. Folding is always associated with vulcanicity. During the million years of folding and uplifting‚ the hard rocks may crack
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let’s talk about the igneous rocks in Hong Kong. Dated back to the late Jurassic age‚ Hong Kong was located near to the destructive plate boundary on the south- east coast of China‚ generating pressure during the subduction activity and causing vulcanicity. In the destructive plate boundary‚ magma currents beneath earth crust converge‚ dragging two plates together while the heavier plate sinks and being subducted under another plate‚ the subducted zone will then be melt back to magma again. Pressure
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endogenetic and exogenetic forces; Origin and evolution of the earth’s crust; Fundamentals of geomagnetism; Physical conditions of the earth’s interior; Geosynclines; Continental drift; Isostasy; Plate tectonics; Recent views on mountain building; Vulcanicity; Earthquakes and Tsunamis; Concepts of geomorphic cycles and Landscape development ; Denudation chronology; Channel morphology; Erosion surfaces; Slope development ; Applied Geomorphology : Geohydrology‚ economic geology and environment.
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greatly from one time and place to another. This is because it depends on the volcanic event‚ the population density of the surrounding area‚ the wealth of the area‚ the weather at the time and sometimes the culture of the inhabitants of the area. Vulcanicity is normally associated with plate tectonic processes and occurs along constructive plate margins‚ destructive plate margins or above hotspots. The type of magma affects the severity and type of volcanic processes that occur because where there is
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Compulsory Part : Living with our physical environment Ch.1 Opportunities and Risks – Is it rational to live in hazard-prone areas? Ch.2 Managing Rivers and Coastal Environments: A continuing challenge Facing changes in the human environment Ch.3 Changing Industrial Location – How and why does it change over space and time? Ch.4 Building a Sustainable City – Are environmental conservation and urban development mutually exclusive? Confronting global challenges Ch.5 Combating Famine – Is
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