GLG103_Lab_9_Worksheet
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Rio Salado Community College *
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Course
103
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Geography
Date
Dec 6, 2023
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GLG 103 Lab 9
Streams Worksheet
Name:
Directions:
A.
Complete all of the items on this page.
B.
Save the document onto your computer.
C.
Submit the worksheet via the link in the lesson.
Part 1 – Promontory Butte, Arizona (34 20’ 26.76” N, 111
01’ 26.32” 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 9.13a
PHOTO – Figure 9.13b
PHOTO
or
PDF
– Figure 9.13c
The Mogollon Rim marks the erosional boundary of the Colorado Plateau in
Arizona. The Colorado Plateau is a roughly circular block shared by Arizona, New
Mexico, Colorado, and Utah. It uplifted during the middle Cenozoic. The rocks
immediately below and above the Rim are horizontal Paleozoic sedimentary
rocks. Much of the rock below the rim is part of large granitic masses with
associated metamorphic rocks.
1.
What is the relief between See Spring (east of Promontory Butte) and the Gila
County Line (at the intersection of Sections 5, 6, 7 and 8, north of See Spring)?
(6 points)
The relief between See Spring and the Gila County Line is 1,040 ft.
2.
2. What is the relief between the Gila County Line (at the intersection of Sections
5, 6, 7 and 8, north of See Spring) and the Promontory (at the triangle on the
Rim Road in Section 5 north of See Spring)? (6 points)
The relief between the Gila County Line and the Promontory is 160 ft.
3.
What is the approximate elevation of the hill at PLS coordinates NW ¼, SE ¼, S
19? (6 points)
The approximate elevation of the hill at PLS coordinates NW ¼ , SE ¼ , S 19 is
6680 ft.
4.
What is the average gradient of Christopher Creek between its headwaters (at
the Gila County Line) and the Highline National Recreation Trail (red and white
dashed line)? This will be easiest determined if you use Figure 9.13a, although
you will have to determine the scale -- remembering that a section is 1 mile by 1
mile. (8 points)
7450 – 5500/3.3. = 500ft/mi.
5.
What is the future of the Mogollon Rim (edge of the plateau around Promontory
Butte)? (Consider the gradients of the streams above and below the Rim, and
their contrasting erosion potentials.) (6 points)
The Mogollon Rim will be eroded back to the northeast due to Christopher Creek.
6.
Draw a topographic profile along line A-A’ using the Grid for Topographic Profile
(Figure 9.13c).
Insert a picture of your drawing here.
(10 points)
Part 2 – Jackson, Mississippi-Louisiana (32 50’ 22.40N, 91
11’ 54.47W)
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 9.14a
PHOTO – Figure 9.14b
This area is on the lower Mississippi River Valley where the floodplain is broad,
very flat, and less than 100 feet above sea level. Underlying sediments are
gently dipping Cenozoic coastal sediments and floodplain silts, sands and muds.
7.
Lake Providence is a feature called what?
(5 points)
Lake Providence is a feature called an oxbow lake.
8.
Notice that the political boundary between Mississippi and Louisiana is the
Mississippi River.
What problems do you see in establishing this river as a
political boundary?
(7 points)
The problem I see in establishing this river as a political boundary is that it is
likely going to change over time due to erosion of river channels.
9.
Did the Willow Cut-Off increase, decrease or not affect the gradient of the
Mississippi River?
Explain.
(6 points)
The Willow Cut-Off increased the gradient of the Mississippi River because it
reduced the length of the river.
10.Name and describe 3 specific features on the map that indicate past channels of
the Mississippi River.
(5 points)
Three specific features on the map that indicate past channels of the Mississippi River are oxbow
lakes, alluvial rivers, and swampy backwaters.
Part 3 – Norris, Tennessee (36 09’ 28.73” N, 84 00’ 32.35”
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 9.15a
PHOTO – Figure 9.15b
The southeastern portion of the map lies within the Ridge and Valley province of
the Appalachian Mountains. Rocks are anticlinal and synclinal Paleozoic
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sediments that have eroded to parallel ridges of resistant rock and intervening
valleys of weaker rock.
11.What is the drainage pattern in the southeast corner of the map?
(7 points)
The drainage pattern in the southeast corner of the map is a Trellis pattern.
12.That topography and the drainage pattern tell you what about the rocks beneath
(review the section on drainage patterns)?
(7 points)
That topography and the drainage pattern tell me that the rocks beneath
form ridges and valleys.
13.Describe a scenario that explains Hinds Creek cutting through Bluebird Ridge (in
the southeast quarter of the map).
(7 points)
The stream cut through Bluebird Ridge in the low areas.
14.The passage of Hinds Creek through Bluebird Ridge is called a/an ___________?
(3
points)
Water Gap
Part 4 – Renova West, Pennsylvania (41 18’ 21.80” N, 77
48’ 31.83” W)
Use this map which is embedded in the lab procedures page and linked below to
answer the following questions.
MAP – Figure 9.16a
PHOTO – Figure 9.16b
This map area is underlain by mildly to undeformed Paleozoic sedimentary
rocks. Drainage is largely dendritic, with the West Branch Susquehanna River
and its immediate tributaries occupying steep gorges.
15.What is the maximum depth of the valley of the West Branch Susquehanna
River? (Calculate this near the town of Westport.)
(5 points)
The maximum depth of the valley of the West Branch Susquehanna River is 685
ft.
16.Explain how you know that this area has experienced uplift in the not too distant
geologic past.
(6 points)
The erosion occurring at sea level resulted in the terraces varying in size.