Sadia khan Per 4 3/12/12 Volcano internet assignment 1. Three types of volcanoes are the shield volcano‚ Strato Volcano’s and cinder cones .The Shield volcanos are usually built entirely from lava flow they are name for their large size and low profile. The Starto’s volcano’s have steep sides with cones that stick out like huge bumps. They are built up when eruptions of viscous lava‚ tephra‚ and pyroclastic flows happen. The Cinder cones is a steep conical hill of tephra that accumulate
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exaggerated): 1. Large magma chamber2. Bedrock3. Conduit (pipe)4. Base5. Sill6. Dike7. Layers of ash emitted by the volcano8. Flank 9. Layers of lava emitted by the volcano10. Throat11. Parasitic cone12. Lava flow13. Vent14. Crater15. Ash cloud Why do volcanoes erupt? Hot melted rocks collect under the Earth’s surface and when the pressure becomes too hard‚ the Earth’s skin breaks‚ and a volcano erupts. The melted rock inside the Earth is called magma‚ but when it comes out in an eruption‚ it is called
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VOLCANOES Most people have never seen a real volcano but have learned about them through movies or books. So when most people think of a volcano‚ they usually conjure up the Hollywood version: a huge‚ menacing conical mountain that explodes and spews out masses of lava which falls on rampaging dinosaurs‚ screaming cave people‚ or fleeing mobs of betogaed Romans - depending on their favorite volcano disaster movie. While those types of volcanoes do indeed exist‚ they represent only one "species"
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Volcanoes Joy Allen EVS1001 T 5:30 March 26th 2013 In this essay I will describe how volcanoes affect our environment. They both positively and negatively impact our world. I lived on the big island of Hawaii for a while‚ and got to experience firsthand the power of the volcanoes. I walked through lava tubes‚ dormant craters‚ and even watched red hot lava slither down the side of Kilauea and into the Pacific Ocean. They have fascinated me ever since. What is a volcano? “Volcanoes are awesome
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Introduction A volcano is an opening‚ or rupture‚ in a planet’s surface or crust‚ which allows hot magma‚ volcanic ash and gases to escape from the magma chamber below the surface. How is a volcano formed? Most volcanoes are formed by the movement of tectonic plates on the surface of the earth. These plates are basically huge pieces of rock that ‘float’ on the mantle (a layer of the earth that is sort-of liquid rock). The tectonic plates are in constant motion‚ albeit very slow motion. They sometimes
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lapilli‚ volcanic bombs and blocks)‚ and various gases are expelled from a volcanic vent or fissure. Several types of volcanic eruptions have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed. Some volcanoes may exhibit only one characteristic type of eruption during a period of activity‚ while others may display an entire sequence of types all in one eruptive series. There are three different metatypes of eruptions. The
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Shield volcanoes Main article: Shield volcano Shield volcanoes‚ so named for their broad‚ shield-like profiles‚ are formed by the eruption of low-viscosity lava that can flow a great distance from a vent‚ but not generally explode catastrophically. Since low-viscosity magma is typically low in silica‚ shield volcanoes are more common in oceanic than continental settings. The Hawaiian volcanic chain is a series of shield cones‚ and they are common in Iceland‚ as well. Lava domes Main article:
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Geoff Hibbs May 4‚ 2012 Primary Succession & Species Diversity of Flora on Mount St. Helens‚ 32 Years PostEruption On May 18 1980‚ Mount St. Helens‚ a stratovolcano in western Washington‚ erupted. The eruption scoured the slopes of the volcano removing vegetation and soil from the vicinity of the mountain. 32 years after the eruption‚ vegetation has returned to the mountain. The author’s main interest in this field is the methods by which vascular plants re-establish themselves after cataclysmic
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Underwater Volcanoes Submarine volcanoes or underwater volcanoes‚ come in all shapes and sizes and‚ are found across the world from Hawaii and California to Iceland‚ Japan‚ New Zealand and Antarctica. Worldwide‚ there are an estimated 5‚000 active submerged volcanoes‚ with the highest volcanoes in shallow water rising above sea level. Most submerged volcanoes‚ however‚ are located on ocean ridges. Volcanoes are dangerous‚ but when compared to land volcanoes‚ submarine volcanoes pose less
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Volcanoes are generally not preserved in the geologic rock record as they are usually eroded away. However‚ the various materials erupted from volcanoes are often found preserved in the rock record. From what you have learned about the different types of volcanoes‚ how could you infer what type of volcano erupted in a given area based on the type of volcanic deposits now found as layers of rock? Give specific examples‚ and briefly discuss how some materials may be linked to different types of volcanoes
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