Skip 1a and 1b please Physical Geogaphy Laboratory Manual Name Section EXERCISE

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Skip 1a and 1b please

Physical Geogaphy Laboratory Manual Name Section EXERCISE 48 PROBLEMS-PART VI-INTERNET The following questions are based on Figures 48.9, 48-10, 48-11, 48-12. 48-13, and 48-14. photographs you can view from the Hess Physical Geography Laboratory Manual. 12th edition website at www.MasteringGeography.com, then select Exercise 48, or scan the QR code for this exercise. 1. (a) Which photograph-Figure 48-9 or Figure 48-10-shows a deposit of glacial till? tb) Describe the evidence you see in the photographs that supports your answer 2. (a) Which photograph-Figure 48-11 or Figure 48-12-shows a landscape predomi- Figure 48- nantly shaped by glacial erosion? Figure 48- (b) Describe the evidence you see in the photographs that supports your answer 3. Look at Figure 48-13, a photograph showing a glaciated landscape on the eastern side of the Sierra Nevada mountains in California. (a) What erosional feature is marked by the letter"A? (b) what erosional feature is marked by the letter"B"? Look at Figure 48-14, a photograph showing the terminus of the Emmons Glacier on 4. Mount Rainier in Washington. The end of the Emmons Glacier is heavily mantled with rock debris. (a) What kind of depositional feature is forming in the area marked with the letter "C2 What kind of depositional feature is marked by the letter "D"? (b) (c) Was the feature marked "D" formed by the present-day Emmons Glacier? (d) How do you know?

Explanation / Answer

2.a) Between Figure 48-11 and Figure 48-12 (assuming the map is figure 48-12 since it is not marked), the landscape shown in Figure 48-12 is more predominanty shaped by a glacier.

2.b) In Figure 48-12, the glacier is present at the foothills, so it is a Piedmont type glacier and the continuation of the broad U-shaped valley of the glacier beyond the foothills, precisely indicate the path of the glacier. Also, this is supported by the presence of a small stream in the broad valley of the glacier (the valley is not cut only by the stream because in the hilly regions, it forms very narrow shaped valleys).

It is very hard to specifically say that the landform in Figure 48-11, is indeed a glacial landform. If it is a glacial landform then it can be a Fjord but if it is not then it can be any random inlet. Fjords look like narrow inlets but they are deeply cut glacial valley inundated by sea water.

3.a) The glacial feature is a Corrie. Corries are rounded, armchair shaped depression near the peak where snow accumulates. With continued accumulation the snow converts to ice which move downslope due to gravity and eventually forming a glacier.

3.b) The glacial feature is a Horn. Horns are pyramidal shaped sharp peaks which are generally surrounded by corries.

4.a) The feature is a Terminal moraine. Deposits of sediment, rock boulders, etc. which are deposited by the glacier at its ternimus is Terminal moraine.

4.b) The feature is a lateral moraine. During the movement of glacier, it can deposit its entrained materials (boulders, pebbles, fine sediments) laterally along its valley wall. These moraines are Lateral moraine. In the Figure 48-14, the lateral moraine was deposited within its u shaped valley (bounded by steep hill slopes) by the glacier and near the valley wall.

4.c) No

4.d) It is evident from the image that the Emmons glacier is retreating (due to global warming). The landform at D was made by the glacier in the past but present glacier has deposited its sediment load and terminating before reaching the point D. So Emmons glacier in the past made the terminal moraine at D.

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