where plates move against or over each other‚ or dive back below the surface. As the plates move‚ mountains are uplifted‚ the sea floor cracks and spreads‚ volcanoes erupt‚ and new land is formed. I think that volcanoes present the greatest challenges to human. And I will try to explain my point of view. As I have already mentioned volcanoes can form a new lands‚ without them we would not have Hawaii Iceland and many other most magnificent places in the world. On the other hand‚ volcanic eruptions
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Volcanoes Of the many natural forces which have defined the Western United States and Canada‚ volcanoes are among the most dramatic. Five of these natural wonders find their homes in National Parks‚ ranging from Hawaii to British Columbia. Their eruptions occur on mountains on the Ring of Fire‚ when one portion of the earth’s crust slides beneath another‚ and melts under high heat and pressure. Magma erupts from beneath the surface and cause lakebeds‚ mountain peaks and huge boulders.
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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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To what extent are volcanoes more harmful to our society than earthquakes? Many people may argue that volcanoes are much more dangerous than earthquakes due to the devastating impact it has on people lives and the area it takes place in; however‚ others may solidify that earthquakes are infinitely more catastrophic than volcanoes considering the amount of destruction that it causes. There are two types of plates‚ oceanic and continental. Various types of movement occur along the different types
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the biggest volcanoes in the Philippines whereas Mount St. Helens is located in the continent of North America. It is in the USA in the state of Washington‚ which in the far west of America. It is in the mountain range the Rockies. Pinatubo is a composite volcano and was dormant for 500 years until the June the 12th 1991 however St. Helens was dormant for 123 years and is a composite volcano too. The first sign of activity at Mount St. Helens in 1980 was a series of small earthquakes that began
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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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faults lead to be a lot more destruction. Earthquakes are a trembling or shaking of the ground caused by a sudden release of energy stored in rocks beneath earths surface. Earthquakes appear all over the planet‚ and there are many different sizes. Some earthquakes destroy entire cities while others only shake the ground for a moment. Faults are one of the causes of earthquakes‚ which I will tell about soon as well as the hazards and benefits they give. Earthquakes can be caused in many ways‚ some even
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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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