asthenosphere creating a rift and pushing magma upward to fill in the crack. With a convergent boundary the plates move toward each other with one plate subducted under another plate. At the location where the plate sinks under another plate is called the subduction zone. Finally‚ with a transform boundary two plates slide horizontally past each other rubbing (Murck‚ Skinner‚ McKenzie). To follow‚ each of the different boundaries move in different ways but mostly all move at the same speed. The plates are
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B.C‚ around 1650‚ there was an eruption of the Thera volcano. Located in Greece‚ the volcano is in modern-day Santorini an island in the south of the Aegean Sea (Fig 1). Thera is part of the South Aegean Volcanic arc‚ which a consequence of the subduction of the African Tectonic plate beneath the Eurasian Tectonic plate.8‚9 The convergence of the two plates formed a chain which consists of many active dormant volcanoes9‚ Thera being the most notable of them. Prior to the eruption‚ the Minoan civilization
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This was formed by the subduction of the Indian plate and the Eurasian plate under Australia. The Sunda Arc (or Sunda Arc) is a volcanic arc associated with the islands of Sumatra and Java‚ Sunda Strait and the Lesser Sunda Islands. A chain of volcanoes forms the topographic spine
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magnitude has a power to eradicate everything around it. Other earthquakes might be the larger but it’s the first one since accurate estimates of magnitude became possible. This was a megathrust earthquake which means that an earthquake occurred in subduction zones where two crustal plates are bumping each other. On May 22‚ 1960‚ in the middle of the afternoon‚ a wide range of place started to quake‚ near Valdivia‚ in southern Chile and lasted in 7 to 10 minutes. Consequently‚ dozens of islands and
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light and less dense than the asthenosphere‚ so it rises and forces its way through weaknesses in the crust. This is how volcanoes are formed on subductive margins. An example‚ is the Aleutian Islands which are a chain of volcanoes formed by the subduction of the pacific oceanic plate underneath the Eurasian/north American (?) plate. Volcanoes formed on these boundaries tend to be more hazardous because they erupt more violently. This is because the melted oceanic plate (which supplies the magma)
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General Study Guide: Test 1 Garrison 8th Edition Go over all powerpoint slides and concepts discussed. Chapter 1 Origins 1. Ages: Universe‚ Earth‚ Ocean 2. Scientific method 3. Big Bang Theory – universe is expanding - two major sources of evidence 4. Hubble’s Law 5. What is a light year and why do we use it to measure distance in the universe? 6. What are 3 major processes that formed the solar system and planets? 7. What is most abundant element in solar nebulae? 8. What are
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of these disasters that reshaped a region was the 1902 eruption of Mt. Pelee. On May 8th‚ 1902 the island of Martinique‚ located in the Caribbean Sea‚ was in for a natural disaster of epic proportions. Mt. Pelee is a stratovolcano located on the subduction zone between the Atlantic and Caribbean plates. Early in the morning‚ locals spotted many rare animals such as snakes were moving down from Mt. Pelee to the lower lying cities. This was unusual for this to happen. Minutes later‚ the volcano spewed
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“Volcanic and seismic events are major pieces of evidence towards proving that plate tectonics theory is valid’ Discuss the extent to which you agree with this statement (40 marks) The plate tectonics theory was made by a German named Alfred Wegener. He stated that a single continent existed about 300 million years ago named Pangaea and that it split into two continents of Laurasia in the north and Gondwanaland in the south. Today’s continents were formed by further splitting of the two masses
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EAR 105 extra-credit study guide. This is both a study guide and an extra credit assignment worth 10 points on your exam! Using your class notes and the book‚ please answer the following questions with words or with sketches. Use this as a study guide. Remember‚ it will count as extra credit toward your test grade. You may work in groups of 4 or less. If you do work in groups‚ all names go on ONE copy that is handed to me. You may work on separate sheets of paper‚ or answer using this document
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very explosive eruptions and pose a great many problems for people and animals nearby1. This is in contrast to the volcanoes found in Hawaii which have slow flowing lava eruptions and few if any massive explosions. Mount St. Helens is formed by a subduction zone where the Juan de Fuca Plate plunges beneath the North American Plate causing the uplifting of the Cascade Mountains. The last eruption took place on May 18‚ 1980 and had such a force that was compared to 500 Hiroshima atomic bombs going off
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