GLG103_Lab_13_Worksheet_rev
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Rio Salado Community College *
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103
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Geography
Date
Dec 6, 2023
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GLG103 Lab 13 - Shorelines Worksheet
Name: Willow Sutton Part 1 – Lynn, Massachusetts
Use this map and photo which are embedded in the lab procedures page and linked below to answer the following questions or complete the activities.
MAP
– Figure 13.16a
PHOTO
– Figure 13.16b
1. The town of Nahant occupies what shoreline feature? (5 points)
The town of Nahant occupies a tombolo. 2. Where is there another similar feature located on the map? (4 points)
There is another similar feature located at the end of the coastline. 3. What evidence is there that Lynn Harbor is filling with sediment? (5 points)
Lynn Harbor is filling with sediment due to the tidal flat arounds the harbor. 4. What are Ram Island, Little Pig Rocks, and the other rocky outliers called? (3 points)
Ram Island, Little Pig Rocks, and the other rocky outliers are called Sea stacks. 5. Why is the topography offshore near Marble Neck so irregular? (4 points)
The topography offshore near Marble Neck is so irregular because the land has not been
submerged for a long period of time.
Part 2 – Kingston, Rhode Island
Use this map and photo which are embedded in the lab procedures page and linked below to answer the following questions or complete the activities.
MAP
– Figure 13.17a
PHOTO
– Figure 13.17b
6. What is the feature across Trustom Pond? How did it form? (5 points)
The feature across Trustom Pond is a Baymouth bar. It exists as a result of continuous sand deposits creating a block between the rest of the body of water and the pond. 7. Why is Green Hill Pond not Green Hill Lagoon? (4 points)
Green Hill Pond is not Green Hill Lagoon because it is blocked off from the rest of the ocean due to the Baymouth bar. 8. What is the future of Green Hill Pond? (3 points)
Green Hill Pond will likely disappear as the Baymouth bar is washed away with water erosion. 9. In what direction is the longshore current moving? Explain. (6 points)
The longshore current is moving East because it follows the beach drift. 10. What is the highest elevation at Moonstone Beach? (4 points)
The highest elevation at Moonstone Beach is 20 ft. 11. How wide is Green Hill Beach where it is crossed by the “81” line? (3 points)
Green Hill Beach is 0.2 miles wide where it crossed by the “81” line.
Part 3 – San Clemente Island Central, California
Use this map and photo which are embedded in the lab procedures page and linked below to answer the following questions or complete the activities.
MAP
– Figure 13.18a
MAP
– Figure 13.18b – Full-sized Map Profile
PHOTO
or PDF
– Figure 13.18c - Topographic Profile
PHOTO
– Figure 13.18d
12. Draw a topographic profile along line D – D’ using the full-sized map profile (Figure 13.18b) and the Grid for Topographic Profile (Figure 13.18c). (You do not have to account for every contour line, especially in the steepest areas, but you will have to use your judgment so you get an accurate representation.) Insert a picture of your drawing here. (10 points)
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13. What are the flat (or very gently sloping) areas called? (5 points)
The flat (or very gently sloping) areas are called Elevated beach terraces. 14. How many of the features from Question #13 do you count in Figure #13.18? (4 points)
I count 3 features from Question #13 in Figure #13.18. 15. Is this a submergent or emergent coastline? Explain. (6 points)
This is an emergent coastline due to the elevated beach terraces.
Part 4 – Cape Code, Massachusetts
Use the image embedded in the lab procedures page or linked below to answer the following questions or complete the activities.
PHOTO
– Figure 13.19
16. What shoreline feature is the hook of Cape Cod? (4 points)
The hook of Cape Cod is a spit. 17. In what direction is the longshore current moving at the tip of Cape Cod? (North is toward the top) (4 points)
The longshore current at the tip of Cape Code is moving Southeast. Part 5 – Miami, Florida
Use the image embedded in the lab procedures page or linked below to answer the following questions or complete the activities.
PHOTO
– Figure 13.20
18. In what direction does the longshore current flow? Explain. (6 points)
The longshore current flows in the southwest direction. This can be seen due to the sands being pushed in the southwest direction.
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Part 6 – Kalae, Hawaii
Use the map and images embedded in the lab procedures page and linked below to answer the following questions or complete the activities.
MAP
– Figure 13.21
PHOTO – Figure 13.22 - Mahana and its Beach
PHOTO – Figure 13.23 - Microscopic view of Beach Sand
The islands in the Hawaiian chain have moved across a stationary hot spot seated in Earth’s upper mantle. The island of Hawaii is currently atop that hot spot and, as you probably know, Hawaii (and its sister islands) is formed entirely from basaltic volcanic flows.
19. Looking at the topographic map of the southern tip of the island of Hawaii, describe the character of the topographic lines. What do they tell you about the terrain of the slopes leading
to the southeastern coast? (5 points)
The slope leading to the southeastern coast is a slow decrease. It travels down to the southern tip. 20. Find Mahana Bay, a prominent indentation in the southeastern coastline north of South Point. Here the sand has a very distinctive color, see Figures 13.22 and 13.23. What is the mineral composition of this sand
(Review hints to recognize sand composition in the
Minerals in Sand section of Lab 12
)
? (5 points)
The mineral composition of this sand is lava rock and shell fragments. 21. Consider the stability of the mineral comprising the beach in Mahana Bay, and hypothesize about why it is so abundant here. (You may have to review information in the Igneous Rocks Lab.) (5 points)
The Green sediment appears to be Olivine and therefore would be so abundant in the Mahana Bay.