Glacier and ClimateLab

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Laramie County Community College *

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1001

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Geography

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Jan 9, 2024

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docx

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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? 2. Is it an erosional glacial landform, or a depositional one? How do you know? 3. Which direction in Lituya Bay did the glacier once flow? Defend your answer. 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? 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.) 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.

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? 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? 9. Is a cirque an erosional glacial landform, or a depositional one? 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.) 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? 12. On the topographic map, what patterns in the contour lines tell you exactly where the crests of those ridges are? 13. Are those ridges an erosional glacial landform, or depositional? C. Williamson, New York 14. Study the contour lines of Prospect Hill on the map. Picture in your mind what the profile of Prospect Hill would look like, if you were looking at it from the west and dawn was breaking in the sky behind it. Could you sketch the profile on a piece of paper? 15. Prospect Hill and the hills near Jagger and Lyon Roads are a particular type of glacial landform produced by an ice sheet that flowed over a relatively flat area. What is this type of glacial landform called?

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