Earthquakes and Logarithms Earthquakes are responsible for a wast majority of natural hazards on our planet. This natural geological phenomena are almost impossible to predict‚ and they occur usually in zones of the planet that are prone to movement in the uppermost crust of the earth. Certain areas are more likely to experience earthquakes‚ and also the aftermath of the earthquakes can be just as destructive or sometimes even more. Different methods of measuring earthquakes have been implemented
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continental drift; Evidence he used includes matching fossils‚ rock types‚ and ancient climates. 4. The three types of plate boundaries are: * Divergent boundaries are a region where the rigid plates are moving apart‚ typified by the oceanic ridges * Convergent boundaries are a boundary in which two plates move together * Transform boundaries are a boundary in which two plates slide past each other without creating or destroying lithosphere 5. Seismic waves are vibrations that
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Assignment: Sedimentary Rocks * Where do sedimentary rocks originate? Sedimentary rocks are the most common rock on earth. Sedimentary rocks form at‚ or very near‚ the Earth’s surface where rocks particles transported by wind‚ water and ice are deposited on dry land‚ on the beds of rivers and lakes and in marine environments: beaches‚ deltas and the sea (Sedimentary Rocks‚ 2001). The earth surface is constantly moving‚ materials are continually being deposited through various parts of the
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Understanding the Movement of Earth Continental drift is the idea that continents move freely over Earth’s surface‚ changing their positions relative to one another over time. This hypothesis has been around for more than 130 years. It’s amazing to know that once ago these continents on Earth were once joined together and have split and moved apart from one another. In 1596‚ Abraham Ortelius hypothesized that continents “drift”‚ but later a German meteorologist named‚ Alfred Wegener‚ fully developed
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Subducting A subduction zone is formed at convergent boundaries by which an oceanic plate slides slowly under a continental plate into the Earth’s mantle‚ as the result of pressure and friction. After a long period of time the overriding continental plate is lifted up creating a mountain range. This is how the Himalayas were formed. Sometimes the extreme heat and pressure exerted on the subducting oceanic plate causes an uplift of magma from the mantle which rises above the surface‚ creating a volcano
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represents the main components of the Earth’s crust? A) oxygen‚ uranium‚ thorium. B) oxygen‚ silicon‚ uranium. C) oxygen‚ silicon‚ aluminum. D) iron‚ aluminum‚ carbon. Correct answer(s): C 5. A boundary in which crustal plates move past one another is called a: A) transform fault. B) convergent zone. C) divergent zone. D) rift valley. Correct answer(s): A 6. One cubic meter of which of these would weigh the most? A) seawater B) granite rock C) basaltic rock D) mantle Correct answer(s):
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volcanic eruptions. DISTRIBUTION OF VOLCANOES Much of the present-day volcanic activity is clearly related to plate tectonic movements and most volcanoes are located at or close to lithospheric plate boundaries (Fig. I-1). About 80% of the volcanoes occur above subduction zones at convergent boundaries‚ either as volcanic belts on continental margins or as island-arcs comprised of a chain of volcanoes formed in an oceanic setting. Typical examples of continental volcanic belts are the volcanoes
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Montagu‚ Bellingshausen‚ Thule‚ and Cook Islands. The Scotia plate shares boundaries with the South American plate to the north‚ the Antarctic plate to the south and west‚ and the South Sandwich microplate to the east. The South Sandwich microplate is sometimes considered as a part of the Scotia plate. To the north and east the South Sandwich microplate is subducting under the South American Plate at a convergent boundary. This area is known as the South Sandawich trench. The Scotia plate forms a
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examples of what kind of plate boundaries. -divergent Andes Mountains‚ Cascade Mountains‚ Aleutian Islands‚ Mariana Islands‚ Himalaya Mountains‚ and the Alps are examples of what kind of plate boundaries -convergent Is it a faster or slower spreading mid-ocean ridge that produces broader and less rugged segments? -faster When you have Oceanic-Contintental convergance‚ which one becomes subducted? -oceanic The San Andreas Fault is what kind of boundary? -transform The areas
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Fossils c. Rock Types and Structures d. Ancient Climates C. Evidence of Plate Tectonics 1. Sea-floor Spreading 2. Paleomagnetism D. Plate Boundaries 1. Divergent Plate Boundary 2. Convergent Plate Boundary a. Oceanic-Oceanic Convergence b. Oceanic-Continental Convergence c. Continental-Continental Convergence 3. Transform Plate Boundary E. Convection F. Hot Spots G. Volcanism 1. Warning Signs of a volcanic eruption H. Earthquakes 1. Focus 2. Epicenter 3. Elastic Rebound
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