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Name EXERCISE 48: Alpine Glaciation EXERCISE 48 PROBLEMS-PART V-GOOGLE EARTHTM Section To answer the following questions, go to the Hess Physical Geography Laboratory Manua edition, website at www.MasteringGeography.com, and select "Exercise 48 Part " to open a KMZ file in Google Earth, or ercise 48 Part V Google Earth"? Park in nort ing the Pleistocene QR code for this exercise and view hern Montana. The mountains here were extensively glaciated by alpine glaciers dur "Ex video." The opening view is looking north over Glacier National 1. Fly to Point 1. In what kind of glacial landform is this lake found? (a) (b) 2. Fly to Point 2. What kind of glacial landform is shown here? Fly to Point 3. closer to the present level of the lake than the valley marked by Point 2? What might explain why this valley enters the valley of Lake Sherburne (a) (b) Fly to Point 4. What kind of glacial landform is shown here? How does this kind of glacial feature develop? 3. Fly to Point 5 along the eastern side of the Sierra Nevada Mountains in California. This view shows large lateral moraines at the bottom of Lee Vining Canyon. During the Pleis tocene, glaciers flowed to the east through Lee Vining Canyon from the crest of the Si erra down into the Mono Lake basin. Notice that there is a pair of moraines on each side of the canyon (this area is also shown in Maps T-13 and T-23a). Point 6 marks the crest of one of the inner moraines formed by a different glacial advance during the Pleistocene than those that left the moraines marked by Point 5 4. (a) (b) (c) Which moraine formed first, the one marked Point 5 or Point 6? How do you know? How deep (thick) was the ice in the glacier that formed the lateral moraines at Point 5? You may assume that the ice reached the top of this lateral moraine. How much deeper was the glacier that left the moraines marked by Point 5 than those (d) y to Point 7 in the Tracy Arm fjord in Alaska. Compare the location of the South Sawyer lacier's terminus shown in Map T-14 (mapped in 1960) to that shown in the latest Google Earth imagery. Using the "ruler" function in Google EarthTM or the graphic map scale in the front of the Lab Manual, estimate how far the glacier has retreated. marked by Point 6? (Compare the moraine heights at the same place in the valley.)Explanation / Answer
Answer to Q.no 1- Point 1 represents a water body also known as Pater Noster lake. These lakes are formed in Alpine valleys and are created by recessional morraines that are formed by upstream retreat and melting of ice.
Answer to Q.no 2
(a) - The glacial landform depicted by Point 2 is Morraine. Morraines are till(materials) left behind by glaciers.
(b) - Point B on the image is represented by a landform known as V-shaped valley. This valley enters the valley of Lake Sherburne closer to the present level of the lake marked by Point 2 because it is a continuous stretch with regular topography, whereas, point 2 is marked by a landform called Hanging valley which is carved by small glaciers and the elevation of the valley floor is 'hanging' high above the elevation of the valley floor carved out by a larger glaciers.
Answer to Q.no 3-
(a) Point 4 represents a landform called 'Horn'.
(b) 'Horn' is formed when the sides of the peak gets eroded.
Answer to Q.no 4
(a) Point 5 and Point 6 both represent Lateral Morraine. But Point 5 is formed first.
(c) The thickness of the ice sheet could have possibly been around 7700 feet.
(d) The difference in ice sheet between the two points ( 5 &6) must have been approximately 240-250 feet.
Answer to Q. no 5 - Insufficient Information. (no recent google imagery given)
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