Page 381 - Laboratory Manual in Physical Geology

ACTIVITY 13.2 Mountain Glaciers and Glacial Landforms

Name: ______________________________________ Course/Section: ______________________ Date: ___________

A. FIGURE 13.10 is a topographic map of modern mountain glaciation near Anchorage, Alaska. FIGURE 13.11 is a topographic

map of the southeast part of the Yosemite Falls, California quadrangle (Yosemite National Park), which was shaped by
Pleistocene glaciers (that have since melted away) and modern streams.

1. On the left-hand side of the graph below, construct and label a topographic profile for line S–T across a valley on
FIGURE 13.11 that is being cut by a modern river. Refer to FIGURE 9.16 (Topographic Profile Construction), if needed.

2. On the left-hand side of the graph below, also construct and label a topographic profile for line G–L across a valley on

FIGURE 13.11 that was scoured and shaped by a Pleistocene valley glacier.

3. Which of the above cross sections (river or glacial) is “V” shaped: ____________________
Describe the erosional process that you think causes this shape.
4. Which of the above cross sections (river or glacial) is “U” shaped: ____________________

Describe the erosional process that you think causes this shape.

S/G Yosemite Falls Quad. T/L A Harvard Glacier Valley B
(Figure 13.11) 9500 (Figure 13.10)

9000
8500
8000

7500
7000
6500

6000
5500
5000

4500
4000

3500
3000
2500
2000

1500
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500
0
FEET ABOVE
SEA LEVEL

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