# EXERCISE 29 PROBLEMS-PART I

The following questions are based on the lower right (southeast) corner of ...

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# EXERCISE 29 PROBLEMS-PART I

The following questions are based on the lower right (southeast) corner of the "Greasewood Spring, Arizona," quadrangle (Maps T-18 and T-19 shown in color in the back of the Lab Manual):

1. What is the contour interval of the map? $\qquad$ feet
2. What is the difference in elevation between index contours? $\qquad$ feet
3. What is the elevation of the highest contour line at the top of the eastern Twin Butte? $\qquad$ feet
4. What do the dashed blue lines represent? $\qquad$
5. What do the gray lines around and between the Twin Buttes represent? $\qquad$
6. What is the name of the adjoining quadrangle to the south?
7. The latitude of the upper right (northeast) corner of the map is $35^{\circ} 30^{\prime} \mathrm{N}$, while the longitude of the lower left (southwest) corner of the map is $110^{\circ} 00^{\prime} \mathrm{W}$. Why is this called a " 7.5 minute" topographic map? (Hint: What is "minute" referring to?)
8. At the time this quadrangle was printed, what was the difference (in degrees) between true north and magnetic north for this map? $\qquad$ degrees
9. On all three graphic scales for the map, " 0 " is not at the far left. Explain the reason for this.
10. Using the graphic map scales, determine the maximum width of the eastern Twin Butte (use the $6100^{\prime}$ contour to be the outer edge of the butte). $\qquad$ feet
kilometers

CramX · Accepted Answer

Step 1: I'm here to help! Before I can provide a solution, I need to clarify a few things.. The problem seems to be about interpreting a topographic map, but there are no images or attachments included in the problem description. I assume you're asking for help with the following questions: Step 2: . What is the contour interval of the map? (in feet) Step 3: . What is the difference in elevation between index contours? (in feet) Step 4: . What is the elevation of the highest contour line at the top of the eastern Twin Butte? (in feet) Step 5: . What do the dashed blue lines represent? Step 6: . What do the gray lines around and between the Twin Buttes represent? Step 7: . What is the name of the adjoining quadrangle to the south? Step 8: . Why is this map called a "7.5 minute" topographic map? Step 9: . What was the difference (in degrees) between true north and magnetic north for this map at the time it was printed? (in degrees) Step 10: . Why are the "0" marks not at the far left on any of the graphic scales? Step 11: . Using the graphic map scales, determine the maximum width of the eastern Twin Butte. To provide a proper solution, I would need more context about the map, such as images or a more detailed description. However, I can explain the general concepts and formulas needed to answer these questions. Step 12: . Contour interval: The vertical distance between two consecutive contour lines. You can usually find this information in the map legend. Step 13: . Difference in elevation between index contours: This is the contour interval multiplied by the number of contour lines between two index contours. Index contours are typically thicker or have an index number on them. Step 14: . Elevation of the highest contour line: This is usually indicated in the map or map legend. Step 15: . Dashed blue lines: These often represent streams or rivers. Step 16: . Gray lines: These are usually drainage divides, showing the boundary between different drainage basins. Step 17: . Adjoining quadrangle: This information should be available from the map or map key. Step 18: "7.5 minute" topographic map: This refers to the map scale, which is based on the size of a minute of latitude.. A 7.5-minute map has a scale of 1:24,000, meaning that 1 inch on the map equals 24,000 inches (or 2,000 feet) in the real world. Step 19: . Difference between true north and magnetic north: This information should be available from the map or map key, or from the date and location of the map creation. Step 20: "0" marks not at the far left: This could be due to the map projection or the specific scaling used.. Step 21: . For LaTeX formatting, I will provide an example for question 2: Step 22: . If the contour interval is 40 feet and there are 5 contour lines between two index contours, then the difference in elevation between index contours is: I hope this helps! If you can provide more information or context about the map, I can give more specific answers. Final Answer: (5 \ 	ext{contour lines}) 	imes (40 \ \frac{	ext{feet}}{	ext{contour line}}) = 200 \ 	ext{feet}

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