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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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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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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be associated with most volcanic eruptions (by the general public)‚ lava is rarely responsible for the loss of life. Which hazards would tend to be more deadly? Finally‚ indicate and discuss those hazards that are a direct result of a volcanic eruption as well as those hazards that are indirectly linked. (Hint: think of indirectly associated” hazards as “side effects.”) Some of volcanic hazards include gases‚ lava and pyroclastic flows‚ landslides and earthquakes and explosive eruptions
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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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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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of rock including sedimentary and metamorphic rock. Igneous rock is formed from the cooling and solidification of lava or magma. Igneous rock can be formed with our without crystallization‚ below the surface as intrusive rocks or on the surface as extrusive rocks. Volcanic rocks also known as extrusive igneous rocks include all the products resulting from volcanic eruptions of lava flows and fragmented debris called pyroclast. The other type of igneous rock would be plutonic rocks also called intrusive
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Another important aspect from the outside reference source mentioned above is that Vesuvius is a stratovolcano. What is a stratovolcano or what does it consist of? According to our text‚ “stratovolcanoes are tall‚ steep cones built of layers of felsic lava and volcanic ash.
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The lava flows from the Galapagos chain‚ while similar to the Hawaiian‚ do not form a line which is unusual in most volcanic hotspots. When people normally think of a volcano‚ the image is of a Composite or Stratovolcano. Composite volcanos have a conical shape built up by layers of hardened lava‚ pumice and volcanic ash. Composite volcanos typically have steep sides and their eruptions‚ while they
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explosive volcanic eruptions‚ producing fragmentary pyroclastic material or ash. Basaltic Lava. Igneous Bedrock formed approximately 342 to 400 million years ago in the Carboniferous and Devonian Periods. Local environment previously dominated by eruptions of silica-poor magma. Eruptions of silica-poor magma. These rocks were formed from mobile magma‚ poor in silica. It rose to the surface and erupted as fluid lava from shallow-sided volcanoes and fissures. These eruptions are associated with the spreading
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