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NCSU MEA 101 - Learning Journal 18 - Glaciers

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Links: GoQuestion 1Correct1.00 points out of1.00FlagquestionQuestion 2Correct1.00 points out of1.00FlagquestionMy home ► MEA 101 (003) Fall, 2014 ► Module 6 ► Learning Journal 18  GlaciersQUIZ NAVIGATIONFinish reviewStarted onTuesday, November 4, 2014, 6:31 PMStateFinishedCompleted onTuesday, November 4, 2014, 6:44 PMTime taken13 mins 40 secsGrade 3.75 out of 4.00 (94%)Was there a glacier here?Which of the following might describe sediment deposited by a glacier? Poorly sorted, angularExplain your answer: Sample answer: These sediments are poorly sorted because glaciers are capable of carryinganything from boulders to clay particles, and they are angular because many of thesesediments broke off by freeze thaw and have not been exposed to anything to round themoff.The picture below was taken near the Matterhorn (peak in the background) in the Alpsbetween Switzerland and Italy. Based on the pattern of striations left on the surface of thisrock by a glacier, what can you say about the glacier's direction of movement? How doyou know?The rocks/sediment are deposited by multiple ways, all of which do not provide a consistent deposit of sediment. As the glacier rubs against the side of the hills and mountains they pick up sediment, the makeup of which is unorganized.You are logged in as Jonathan Kluger (Log out)MEA 101 (003) Fall, 2014 Geology I: Physical1234Question 3Correct1.00 points out of1.00FlagquestionThe movement of the glacier was straight/parallel. I knowthis because of the presence of glacial stiations.Sample answer: It was moving down the slope. I know this because the scraping of theglacier would be parallel to its movement. Also, glaciers flow down hill or down valley, not uphill.Which of these two valley shapes would you expect a glacier to create?Question 4Complete0.75 points out of1.00FlagquestionSelect one:a. Valley 1 b. Valley 2The correct answer is: Valley 1Using what you already know, make a prediction: how does the valley shapecreated by a glacier compare to the valley shape created by a river? (2-3sentences)The shape of a valley created by a glacier is much more defined than that of a river. This isbecause a glacier is a solid mass, unlike a river, which is free flowing. This is key since theriver (as a liquid) moves with the shape of the land (since it is free flowing). On the otherhand, as a solid, a glacier must manipulate the land, and cause a more defined shape, thatdoes not vary its course of movement very much.Answers will vary. Two sample student answers are below:1) Valleys created by glaciers are U-shaped and leave a very polished bottom surface withstriations to show where the glacier moved across the rock, whereas valleys formed by riversare usually not as wide and have more angular cuts creating more oddly shaped valleys.2) The ice from glaciers "pluck" pieces from bed rock, which excavate bowl shapeddepressions like valley 1. Rivers, however, erode bed rock in a more defined manner,creating the angled V-ridge depressions like valley 2You are logged in as Jonathan Kluger (Log out)Comment:1) Valleys created by glaciers are Ushaped and leave a very polished bottom surface withstriations to show where the glacier moved across the rock, whereas valleys formed by riversare usually not as wide and have more angular cuts creating more oddly shaped valleys.Finish


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