1. Laboratory Questions SAL11 – Lab Manual, Chapter Eleven: Glacial Landscapes Purpose: In this lab you will learn how recognize different types of glacial features from topographic maps and DEM’s.
- Laboratory
Questions
SAL11 – Lab Manual, Chapter Eleven: Glacial Landscapes
Purpose:
In this lab you will learn how recognize different types of glacial features from topographic maps and DEM’s.
Reading Assignment:
Read sections 11.1 through 11.5 inclusive
Review the Lab Assistant – Glaciers found above in this chapter’s folder.
Materials Needed: Protractor, Ruler, Calculator
Exercises: (Show all math work for partial credit)
1. Read the introduction to Exercise 11.4 and answer the following questions about the DEM of Long Island, New York. (Reference Section 11.2)
A) Review Figure 11.7 as modified in the Lab Assistant-Glaciers. Identify labeled features A through E
as either outwash plain, ground moraine, recessional moraine, terminal moraine,
or glacial delta (2.5pts)
B) Which of the two features, B or C, is younger? Explain your
reasoning? (2pts)
C) What was the direction of glacial movement? Give your answer as a quadrant
bearing. (1.5pt)
D) Would you expect the sediments to be more sorted in area A or area E?
Explain. (2pts)
2. Read the introduction to the first part of Exercise 11.5 and look at Figure
11.9 of Passadumkeag, Maine. One of the ways you can tell an esker from a
terminal moraine is the orientation of the ridge. (3pts)
A) What is different about the orientation of the long axis of the ridge of a
esker versus the long axis of the ridge of a terminal moraine? Discuss the
orientation relative to the direction of glacial advance.
B) What is different about the depositional method of an esker versus a
terminal moraine? Discuss sorting.
3. The following questions are based on Figure 11.10 of Weedsport, New York area. Read the second part of Exercise 11.5.
A) Look at the hill labeled 4 and also the one to the west of it in on the
map. Based on the contour lines, describe the shape, orientation, and asymmetry
of the hills. (Hint: one side of the hill is less steep than the others)(2pts)
B) If you dug into this hill, would you expect the grains to be well sorted?
Why or why not? (2pts)
C) What is the length and width of hill 4? Give your answer in
kilometers. (1pt)
D) What is the height of hill 4 above ground level (not
sea level, subtract elevation at the bottom of the hill from the elevation of
the top of the hill)? (1pt)
E) Based on the asymmetry of the hills and the general orientation of all the
hills on the map, what was the direction of glacial advance in this area? Give
your answer as a azimuth bearing. (2pts)
4. Read the introduction to Exercise 11.6 and review DEM of Glacier National Park as modified in the Lab Assistant-Glaciers. Match the letter on the map with one of the following topographic features. (6pts, Reference Section 11.3)
arête, cirque, hanging valley, horn, lake, stream, U-shaped valley
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