Glacier and ClimateLab done

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Laramie County Community College *

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Geography

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Jan 9, 2024

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NAME _______________________________ Glacier & Climate Lab Worksheet Preparation & Directions: Be sure that you have read Chapters 14 & 15 before you begin this activity. Type your answers into this form. Download maps as required. Mark on those maps as directed either digitally or my printing and using pen/cils. Grayscale prints are fine. Either paste them at the end of this document or upload them as separate files. You will find the instructions and maps here: https://commons.wvc.edu/rdawes/g101ocl/labs/glacierslab.html#GlacierL6 Part 1: Glacial Landforms, a map reading exercise A. Lituya Bay West, Alaska 1. Solomon Railroad is not a railroad. It is actually part of a glacial landform. What is the name of that type of glacial landform? an esker 2. Is it an erosional glacial landform, or a depositional one? How do you know? Sand and gravel-filled ridges known as escarpments are created when meltwater from glaciers flows through tunnels inside and beneath them or via meltwater channels on top of them so it is depositional. 3. Which direction in Lituya Bay did the glacier once flow? Defend your answer. The glacier in Lituya Bay once flowed in the South-West Direction 4. By what processes, erosion or deposition, did the glacier form what is now Lituya Bay? In particular, how did the glacier create the higher, hummocky land surrounding Lituya Bay, which includes Solomon Railroad, and how did the glacier create the depression now occupied by Lituya Bay? The glacier that is now Lituya Bay, was formed by mostly erosion. The glacier was able to create the depression that is now occupied by Lituya Bay by creating moraines which are basically sediment deposits, when the glacier was retreating. This also led to the creation of the Solomon Railroad. 5. Which glaciers terminate at Lituya Bay, that you can see the names of on the map? (The one you cannot see the name of is Crillon Glacier.) The glaciers that terminate at Lituya Bay are the Lituya Glaciers and the Cascade Glaciers 6. Recall from studying plate tectonics that southeastern Alaska is a transform plate boundary between the North American and the Pacific plates. Recall from studying streams that most valleys on earth are the result of stream erosion, and stream-eroded valleys tend to curve and branch. An exception is fault-controlled valleys, which tend to run in straight lines. As you can see on the map, Desolation

Valley, Gilbert Inlet, and Crillon Inlet together compose a single, straight valley. What specific type of fault is likely to lie beneath this straight valley in southeastern Alaska? Defend your answer. The specific type of fault that is likely to lie beneath the straight valley in southeastern Alaska is a transform fault 7. Shown on the Lituya Bay East map are lines and zones of brown dots running down the middle of Lituya Glacier. What is the name of this type of glacial feature, and how does it form? The name of this type of glacial feature is a moraine. The way that it forms is by added and deposited debris that came from other glaciers. B. Longs Peak, Colorado 8. A cirque is an amphitheater-shaped (half-bowl-shaped) valley eroded by a glacier into the side of a mountain. The walls of a cirque are very steep and curve around as seen on a map in a partial U shape cutting into the side of the mountain. How many cirques can you see on the Longs Peak Map? In the Longs Peak Map, I am able to see 5 cirques. 9. Is a cirque an erosional glacial landform, or a depositional one? A cirque is known to be an erosional landform 10. Which mountain on the map is the most complete glacial horn? (All the slopes surrounding it are glacially eroded cirques, and the peak is a pyramidal prominence, not just a high point on a ridge.) The mountain on the map that is the most complete glacial horn is the Longs Peak mountain 11. Look at the ridge that joins Longs Peak to Pagoda Mountain, and the ridge that joins Longs Peak to Storm Peak. What is the specific glacial landform name for that type of ridge? The glacial landform name for the ridge that joins Longs Peak to Pagoda Mountain and Longs Peak to Storm Peak is Arete(s). 12. On the topographic map, what patterns in the contour lines tell you exactly where the crests of those ridges are? The patterns that are in the contour lines tell me that the crests of those ridges are located in the locations where Aretes are located 13. Are those ridges an erosional glacial landform, or depositional? The ridges are an erosional glacial landform C. Williamson, New York 14. Study the contour lines of Prospect Hill on the map. Picture in your mind what the profile of Prospect

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