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cal Geosiapa Section EXERCISE 47 PROBLEMS-PART IV-GOoGLE EARTHTM answer the following questions, go to the Hess Physical Geography Laboratory Manual, 12th tion, website at www.MasteringGeography.com, then Exercise 47 and select "Exercise 47 TM', to open a KMZ file in Google Earth, or scan the QR code for this exercise "Exercise 47 Part IV Google Earth M video The opening view is looking north toward . During the Pleistocene, this region was extensively glaci- l view Finger Lakes region of New York ed by ice sheets Fly to Point I in the area of the Finger Lakes. What is the general orientation of this series of lakes? to From Fly to Point 2, a drumlin in the region north of the Finger Lakes, noting the general orien- tation of this feature (a portion of this area is shown in Map T-12). Then fly to Point 3 and 2. Point 4, again noting the general orientation of the drumlins in this area. Most geomorphologists suggest that the long axis of a drumlin reflects the direc- tion of ice flow, with the steepest end facing the direction from which the ice came. Based on this assumption, from which direction did the ice flow over this region? (a) From to Does the general orientation of the Finger Lakes match this? If not, describe the difference in orientation (b) 3. To what extent have roads and other human-built features been influenced by the pattern of drumlins? 4. Fly to Point 5 near Jackson, Michigan. This area was extensively glaciated during the Pleistocene. Fly to Point 6 along Blue Ridge, and then to Point 7, and finally to Point 8 along the same ridge. (a) What kind of glaciofluvial landform is Blue Ridge? (b) How does such a feature form beneath the ice of a glacier? (c) What kind of useful construction material has likely been excavated from Point 8 and the other quarries along Blue Ridge?Explanation / Answer
Ans 1 : The general orientation of these series of Fnger lakes are from North to South.
Ans 2: a) As could be seen in the image of map, the steeper sides of the drumlin is on NNW side and so the orientation is from NNW to SSE. b) The orientation of Finger lakes don't match completely with the drumlins although trend is roughly same, i.e the drumlins are oriented NNW-SSE but the lakes are oriented in the N-S direction. This may have happened because nature is not very regular. Also the drumlins are formed during the advance of a Glacier carrying till materials but the lakes have formed when the glacier retreated and so the orientation may have changed slightly than earlier.
Ans 3 : As we can see from the image of map given, the roads had been constructed parallel to the drumlin and not across it because there is a high altitude hill present on the steeper side. Also the road could be seen to take a bend where the steeper side of drumlin ends. The houses and other manmade features are also built parallel to the orientation of the drumlins and beneath the drumlin where it ends.
Ans 4: a) Blue ridge is a kind of glaciofluvial feature known as Esker. Eskers are sediments deposited by water or stream channels formed beneath the glacier.
b) Eskers do mainly forms when the glacial ice is generally stagnant. The meltwater produced beneath the glacier escapes forming tunnels beneath the Glacier and bounded by tunnel walls,they carry sediments form silt to gravel sized . They sometime flows uphill also if the water pressure is high due to blockage on the downhill side.
c) The kind of construction material which could be extracted from the esker deposits are sand and gravels. They are carried by the melt water within the glacier channel beneath the glacier and deposited as ridges.