Continental Drift Were the continents of this planet always situated the way they are today? Could there have been one supercontinent that over time broke off into the continents we know now? Merriam-Webster Dictionary defines Pangaea as a hypothetical land area believed to have once connected the landmasses of the southern hemisphere with those of the northern hemisphere (Definition of Pangaea). This theory‚ discovered by Alfred Wegener‚ was known as the drift theory. Wegener used the fit of the
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on Earth is constant and only changes or cycles during different climate periods. For instance‚ during warmer periods of climate change glaciers melt and in turn cause a rise in sea level‚ but the amount of water does not change. The water is only cycled from a solid (glacier) to a liquid (water) and when the planet is in a cooler climate period‚ we see glaciers grow and sea levels drop. As the sea levels rise there is more water that can be warmed by the Sun and since water expands as it gets
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precautions are taken to help minimize damages that are caused by the flooding. There are four main reasons that contribute to the river flooding so often. These main reasons for the floods are: Synchrony of discharge with spring thaw‚ ice jams‚ glacial lake plain‚ and the decrease in gradient downstream. The first reason that contributes to the river flooding so often is the ice melting in the spring. The Red River flows northward‚ and when the ice thaws‚ it also runs northward along the valley
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Dakota sandstone formation. It is exposed in many places throughout the Rocky Mountain region and extends from New Mexico northward for 1‚000 miles or more. It is prominent because the sand is cemented together firmly to form a quartzite which resists erosion very well. There are also rocks from the Morrison formation‚ which is composed of mudstone‚ sandstone
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GEO 100 – Environmental Geology - Final Exam Multiple Choice 1. Most astronomers believe that the universe a. has existed in its present state since the beginning of time. b. formed from a huge rotating cloud of gas. c. came into existence as the result of a “Big Bang.” d. is no more than five billion years old. 2. Most of the mass of the solar system is concentrated in a. Jupiter and Saturn. b. Earth. c. the planets. d. the sun. 3. The solar system formed about a. 5 million years ago. b. 4.5 billion
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The Pleistocene period was a time when ecological changes emerged. During this period glacier formations began to arise and have been accredited with playing a role in the divergence of different species. For different species of avian there has been controversy between their origins and speciation events. Studies have been conducted for this controversy to try and find which theory to accept for the songbirds. Even though a majority of studies have accepted Late Pleistocene events role in the speciation
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Iceland The country that I choose is Iceland. Iceland is very unique and interesting not only because of its clean air and amazing scenery but also its natural beauty and landscapes. Nature is a big force of Iceland but the volcano’s‚ waterfalls‚ and glaciers seem to attract most tourist. There landforms are probably the most unique. The Northern Lights is also something that people find very interesting because how it is created and the view you can see. It is something that everyone should see at some
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nomadic hunters from Siberia had “discovered” Alaska and migrated in droves due to a more hospitable weather that was conducive to their nomadic lifestyle. The first passage of people from Asia to America probably took place during the prehistoric glacial period-either before 35‚000 B.C.E. or about 10‚000 years later-when huge amounts of the world’s water froze into sheets of ice (Davidson-Gineapp-Heyrman-Lytle-Stoff‚ 2005). The dramatic drop in the sea levels left the Bering Strait‚ once an impassable
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waves approach an irregular coastline Hydraulic Action - An erosion process - where air becomes trapped and compressed in a joint / crack in a rock by a breaking wave‚ gradually breaking rock apart. Abrasion - An erosion process where cliffs are worn away by rocks and boulders thrown against them by the waves Solution - An erosion process where acids in the sea water gradually dissolve minerals in rocks. Wave Pounding - An erosion process where the shear force of the waves constantly hitting
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Session M1.1: Disaster Risk Management Terms and Concepts Note: For further detail definitions and concepts clarity‚ please visit United Nation International Strategy (UNISDR) website http://www.unisdr.org/eng/terminology/terminology-2009-eng.html Crisis A crisis is any event that is‚ or is expected to lead to‚ an unstable and dangerous situation affecting an individual‚ group‚ community‚ or whole society. Management often requires decisions to be made within a short timeframe & often an event
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