GLG103_Lab_12_Worksheet_rev
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Rio Salado Community College *
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103
Subject
Geography
Date
Dec 6, 2023
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GLG103 Lab 12 - Deserts and Sand Worksheet
Name: Willow Sutton
Part 1 – Ennis, Montana (45 19’ 09.53”N, 111 41’
10.85”W)
Use this map and photos which are embedded in the lab procedures page and linked below to
answer the following questions or complete the activities.
MAP
– Figure 12.19a
MAP
– Figure 12.19b
PHOTO
or
PDF
– Figure 12.19c
PHOTO
– Figure 12.19d
PHOTO
– Figure 12.20a
PHOTO
– Figure 12.20b
PHOTO
– Figure 12.20c
1.
Calculate the gradient of Cedar Creek.
Show your work.
(8 points)
The elevations at Odell Creek and Cedar Creek are 4910 ft and 5760 ft.
5760 ft – 4910 ft = 850ft.
The gradient of Cedar Creek is 850 ft.
2.
Why are the topographic lines across the alluvial fan so squiggly? (7 points)
The topographic lines across the alluvial fan are so squiggly due to the irregular drainage
patterns.
3.
Download and print the full-sized map (Figure 12.19b) and profile grid (Figure 12.c). Draw a
profile along line C-C’ (a profile is looking at the map on its side, or the third dimension). Insert
a picture of your drawing here. Ignoring or leaving this question blank can have a serious
consequence on this lab grade and your understanding of the concepts.
(15 points)
4.
How does the slope of the land differ between the west end (at C) and the east end of that
profile?
Why?
(You may want to include the slope east of C, as you consider this question.)
(7
points)
The slope of the land on the west end is less steep than it is on the east end.
5.
Postulate about what you expect the gradient to do to the east of the map area.
Explain.
(Think about how the land will eventually end up as it can’t go up forever). (7 points)
I expect the gradient to increase coming from the east as it makes its way to the alluvial
fan.
6.
Which of the sands (Figures 12.20a-c) would be most likely to be deposited in one of these
alluvial streams? Explain.
(Look at sorting, roundness, size, and mineral types)
(8 points)
The sands in Figure 12.20a would be most likely deposited in one of these alluvial
streams due to their large particle size.
Part 2 – Algodones Dunes near Yuma, Arizona (32
48'44.61"N, 114 58'00.96"W)
Use these photos which are embedded in the lab procedures page and linked below to answer
the following questions.
PHOTO
– Figure 12.21
PHOTO
– Figure 12.22d
PHOTO
– Figure 12.22e
PHOTO
– Figure 12.22f
7.
What kind of dunes occupy the central portion of this field?
(7 points)
Transverse Dunes occupy the central portion of this field.
8.
In what direction does the wind blow?
Explain.
(7 points)
The wind blows in the southeast direction as a result of the dunes appearing to be
formed by winds from the northeast.
9.
Which of the sands in Figure 12.22d-f was collected in this dune field? They are all 10x
magnification.
Explain how you came to that decision.
(9 points)
The sands in Figure 12.22e were collected in the dune field. The grain size of the sands in
this image are small and round.
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Part 3 – Coastal Dunes, Namibia (17 35’ 19.36” S,
11 51’ 12.27” E)
Use these photos which are embedded in the lab procedures page and linked below to answer
the following questions.
PHOTO
– Figure 12.23
PHOTO
– Figure 12.24
10.
Identify the type of dune in Figure 12.23.
(7 points)
The dune in Figure 12.23 is a barchans dune.
11.
In what direction is the wind blowing?
Explain. (7 points)
The wind is blowing from the south.
12.
In Figure 12.24, why do the dunes suddenly stop as they encounter the river running
east/west across the photo?
What happens to the sand?
(5 points)
The dunes suddenly stop as they encounter the river running east/west across the photo
because they collapse into the river water.
13.
Are there any other locations on Earth where desert sand dunes meet the ocean?
Do an
internet search and consider the latitudes where deserts exist.
(6 points)
There are several locations on Earth where desert sand dunes meet the ocean. For
instance, the Sahara Desert sand dunes meet the Atlantic Ocean.