Note: The intervals are increasing, therefore, the contours indicate a hill. Please refer to this Saskatoon topographic map to complete the next three questions. The following are general characteristics of contour lines: 1. The number of contour lines in-between 7000 and 7100 are 4. Location B is higher. The final answer we get after dividing is the contour interval of the specific topographical map. Generally, there are various contour intervals for the various maps. d. Prepare a vertical Which gas station is the most likely source of the gasoline leak? Q-What is the contour interval for the topographic map shown below?Ans-Contour interval is the vertical distance between two adjacent contour lines on . On most topographic maps, the archeologist determines that there is 16.7% of the parent isotope remaining in the cloth sample. characteristics of contour lines: 1. Closer distance indicates steep slope and wider distance gentle slope. points. This means every point on a contour line has the same altitude as that of the assumed intersecting surface. Because there isnt a 60ft contour line on this hilltop, we know that the hills highest point (the crest) is some elevation between 50 and 60ft. (1 pt) What is the longitude along the eastern edge of this rectangle? Contour plots with Excel and Matplotlib Select the XYZ data arranged as a single range (Range I4:N8 in the data screenshot below). For this computation, the rise, or vertical ground distance, and run, or horizontal ground distance, are needed. 11. Lay a strip 1) The contour interval between contour is 40m. The older unconformity is a Nonconformity, while the younger is a Disconformity. 40 feet - 20 feet = 20 feet The difference between two adjacent contours is called the contour interval, which is 10 ft for the Figure 2-2 example. refers to height in feet, or meters, above sea level). Refer to the topographic map in Figure 7-E3 for an example of contour lines you can use to help you complete this question. What Is Contour Interval? Comparable to figure 8 D-F in ref. How far apart are North America and Mainland Asia in cm? Select the correct answer(s) from the questions below: The horizontal distance between points A and B can be measured with a scaled ruler and used to determine the slope percent. The height of an object above the surface of the sea. Was Carter Lake cut off before or after the state boundary between Nebraska and Iowa was drawn? The lines point toward the center of the depression. Locations A and B are at the same elevation. How old is the burial site? In which stage of the cycle of stream erosion is this area? Each dot represents an elevation number, spaced evenly at 100 m in the horizontal. Vertical Legal. Point D is marked at 10,000 elevation and the next label is marked as 10,500 elevation. It is south of Mammoth Cave. Practice Questions on Geological Structures, 7. Lost your password? What feature(s) can you observe south of Hwy. (1 pt) What is the ratio scale of this map? 16. the entire earth to a city block (or less). 9. Mark Figure 7-E9 with a line to indicate the distance you used in your calculation. How and why do we divide stars into groups by mass? 225 feet; half the contour interval lower than 250 feet. in Figure 9.4, what is the elevation of the intersection of U.S. Route 1 and Maine Route 6 in Topsfield? contour (Z) creates a contour plot containing the isolines of matrix Z, where Z contains height values on the x - y plane. When you join you get additional benefits. You are tasked with creating your own coastal topographic map, so you hike around a coastal area with a GPS receiver (Global Positioning System) and every so often you record your position along with the elevation in metres at that point, which results in the map below (Map 7-E5). Notice the general shape of this feature. These features you are seeing are linear valleys. Lakes/Ponds. Contour lines make a v pattern as they cross streams and rivers, and the v always points towards the upstream direction. indicate what information is contained on a topographic map, and where it can Source: Karla Panchuk (2020) CC BY-SA 4.0, adapted from Joyce M. McBeth (2018) CC BY-SA 4.0 (view source) and Brad Deline (2017) CC BY-SA 3.0 (view source). located below the scale. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. The word contour comes from French, and it is defined as meaning the "outline" of a subject, it often defines a form or an. This plate boundary isn't as simple as the previous examples, meaning another nearby plate boundary directly influences it. The figure on the right shows the 500 mb height map for December 9 with the position of a trough and ridge . Essentially a topographic profile is a side image of a topographic map, but the image is only a representation of the area shown on the line on the topographic map (line A-B on Figure 3.6). The even spacing indicates the hill has a uniform slope. Every sixth contour line has an index contour, which is a bolder or thicker line. Contour lines that are close together show what type of slope? Considering the map, the following steps are used to calculate the contour intervals calculation as follows . Location B is higher. (measure the distance across the Pacific at 40 degrees north latitude- basically measure between Northern California and North Korea)? Provided is a topographic map of a hill with contour lines drawn showing elevation in meters. - Table 8 . Examine the map below to answer the question. The horizontal map distance measures 0.5 inches. submergence and deposition of sedimentary layers 10-13. based on the assemblage of organisms (A-I) in this sample, what is the age of this rock. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. The image to the left shows a perspective view of a river mouth at the head of a valley between a steep cliff (to the left) and a smoother slope (to the right). nervous system and circulatory system endocrine and repertory system circulatory and respiratory systems nervous system and endocrine systems . Refer to the figure below. If the numbers associated with the contour lines are decreasing, there is a decrease in elevation. Upon adding divalent ions, she could regain 70S70 S70S particles, but never 1005 or 1305 particles. 2. For example, if your map scale is 1 inch = 50 ft, then one inch on your graphs y-axis should only represent 50ft of elevation. 8. The contour interval is 20 meters ( Figure 10-2 ), thus each one of the intermediate contour lines crossed to get to point (a) adds 20 meters to the 500-meter index contour line. Answers: 1 Show answers Another question on Biology. They are marked with short, straight lines inside the circle. Set up the cancellation table so all units will cancel, except the desired unit, feet. Which of the three proposed plate tectonic mechanisms would NOT occur at this location? topographic profiles: Remember that topographic maps represent Location A is higher. 31. Describe how you decided on an estimated elevation for points A and E. c. Is the elevation of waypoint A > (greater than) or < (less than) waypoint E? Then, find the difference in elevation between the two points. Expert Answer. As contour intervals are for the calculation of vertical elevation of an area, same way to calculate the horizontal distance it is termed as Horizontal Equivalent. Write your answer in feet. a. What can be said about level surfaces of \varphi? Chapter 3 Topographic Maps by Karen Tefend and Bradley Deline, CC BY-SA 4.0. The difference in elevation between one contour line and the next. which isotopic system should they use. On this map, what is the change in elevation between two adjacent index contour lines? Horizontal Contour lines tend to enclose the smallest areas on ridge tops, which are often narrow or very limited in spatial extent. A. At what depth will the dry mantle rock at point X begin to melt if it is uplifted closer to Earth's surface and its temperature remains the same? long-term time-average of sea level). Therefore: Rise = change in elevation = top (Point A elevation) minus bottom (Point B . Each contour line shows a different elevation. Extra Practice Question on Topographic Maps, Overview of Geological Structures Part 1: Strike, Dip, and Structural Cross-Sections, Exercises on Geological Structures Part 1: Strike, Dip, and Structural Cross-Sections, Overview of Geological Structures Part 2: Folds, Faults, and Unconformities, Exercises on Geological Structures Part 2: Folds, Faults, and Unconformities, 6. Dont forget to add a contour line to the map legend! please add a brief explanation thank you Assume value is an integer variable. The zone from 5100-6400 represents the Earth's ? Refer to the figure below and assume contour interval of 10 feet. 9.4) to estimate the elevation of this point as accurately as possible. The Wadati-Benioff zone is associated with which type of plate boundary? A map has index contours at 250m, 500m, and. What features would you expect to occur at this type of boundary? From the contour map, a profile can be drawn of the terrain. For interval 14, the models trained with DeepAugment elicit stronger connections between the endpoints than those without DeepAugment, but the difference is not significant enough. lowest line (which is 6760 feet, and not marked) has an elevation equal or greater Question 20. The other side is covered with a layer of fiberglass 2.5cm2.5 \mathrm{~cm}2.5cm thick. Start climbing from the foot of a hill toward the top, this is called a rising slope (see Fig. elevation of each index contour line. What type of drainage pattern is present in this area? It is a plane section of the three-dimensional graph of the function f parallel to the-plane. Refining interval counts to include these produced Figure 7 and - Table 8, below. lines enclose smaller and smaller areas. All melodies have contours. Then add 1 to 5 that becomes 6. the final step is the quotient of the difference between 2 index lines (step 2) and the number of lines in between two index lines plus 1 (step 5). How far (in Km) did the pole move in one year during this time period? (2 pts) How would the gradient change if you measured from the peak of Guard Mountain (on the east side of the lake, across from Mount Price) to Garibaldi Lake? C. The Zone from 0-20 km represents the earths? Examine the path of the river that feeds into and flows out of Quail Lake. Adjacent means next to. What type of tectonic plates are present? Determine the elevation at Point A and Point B in the Figure 9 map below. 10,500-10000=500 feet Between these two contour lines if we count, there are 10 counter lines. For producing a detailed study of slope percent = rise/run 100. 10. It is impossible to determine which location is higher. Answer the following questions about these waypoints, based on your best guess estimate of the elevation of each waypoint. (The benchmarks have an "x" to locate the spot where the elevation was surveyed). How are depressions marked on a topographic map? The Grand Canyon is an extraordinarily steep area. Look closely at the topography south of highway, and it changes abruptly. What does this type of drainage pattern indicate about the area? All points on a contour line are at the same elevation. Compare the contour intervals from the Royal Gorge, Colorado map (map 5.1) to the Omaha N, Nebraska-Iowa map. Information Index contours are bold or thicker lines that appear at every fifth contour line. The contour music definition is the same definition in any medium such as visual art,. The numbers are the elevation at the top of the peak. Note: elevation is metres above sea level; thus, sea level = ______ m. 2. If you were standing at the washington monument what direction would you need to walk to get to the U.S. capitol building? Now draw contour lines on your map to represent the pyramid in three-dimensions on your map. Figure 2 is based on a more complicated landscape that I contoured using a dark pen at a 10 m contour interval and using a lighter pen at a 5 m contour interval. The run is 1000 feet and the rise in elevation is 120 feet. How does the direction of motion of the Pacific Plate during the last 1.1 million years differ from direction of movement between 4.7 and 7.2 million years ago? In which stage of the cycle of stream erosion is this area? Would this be an easy location to maintain a railroad? 31? CONTOUR/SPACING= Sets spacing for contour labels; default spacing is 5". A darker, heavier contour line that is labeled with an elevation. What is the physical state of a dry mantle rock at point X? Because the stream flows south, contour a, which lies downstream of contour b, must be the lower of the two. Each contour line shows a different elevation. He wants to follow the easiest possible path, which means he needs to find the most gentle slope up the mountain. d. Is the elevation of waypoint D > or < waypoint C? A contour line of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. How is the top of a mountain shown on a topographic map? The small contour interval, the survey work and plotting have to be more accurate. D 009 -800 N O a) 10 b) 20 D -600 -800 N a) 10 Ob) 20 c) 40 d) 50 Which point (A,B,C, D) has an elevation of 344 feet? Example Calculation of Contour Intervals: Factors Affecting Durability of Fiber Reinforced Concrete (FRC), Measuring Tape: Anatomy, Marking, and Steps to Measure, Tacheometric Surveying: Principle, Procedure, and Advantages, Types of Foundation for Buildings and their Uses [PDF], Compressive Strength of Concrete -Cube Test [PDF], Procedure, Results, 16 Types of Heavy Equipment Used in Construction, Calculate Quantities of Materials for Concrete -Cement, Sand, Aggregates, Methods of Rainwater Harvesting [PDF]: Components, Transportation, and Storage, Exploring the Impact of Construction Robots on the Industry, How to Maintain a Brick Chimney for Maximum Efficiency, A Shining Future: The Benefits of Solar Energy, What You Should Know Before Installing Mud Flooring. 0.5 in 24,000 in/in = 12,000 in What type of bedrock is present in this area? Slope Worksheet (to be completed), Contact Us: NWCG Comments & Questions | USA.GOV | Notices | Accessibility | Copyrights | Linking Policy | Records Management | FAQs, M-581, Fire Program Management Course Steering Committee, M-582, AA Advanced Wildland Fire Course Steering Committee, Committee Roles and Membership Information, Course Steering Committee Guidance & Templates, International Association of Fire Chiefs Roster, National Association of State Foresters Roster, Alternative Pathways to NWCG Qualification, Wildland Fire Leadership Development Program, Table 5.3 Perimeter Estimation for Point Source Fires, Table 5.4 Area Estimation for Point Source Fires. distance is found on the scale. slope percent = rise/run 100 Once your contour lines are drawn, you will notice that you had to draw some lines closer together in some areas and wider apart in other areasand that you may have even enclosed an area by drawing a contour line in a circular pattern. Earthwork estimations for any type of structure like bridges, dams or roads can be found out with the help of contour intervals in a map. Make sure to zoom out to get a good view of the relevant features. Show your work below. Using the contour lines, determine the upstream direction of the creek. The figure above illustrates a depression and its representation using contour lines. These circular patterns indicate hilltops, like in the diagram below (Figure 3.6). A mountaineer is planning an expedition. Which of the following statements about them is true? If the topographic map in Figure 3.6 has a fractional scale of 1:12,000 then 1 inch is equal to 12,000 inches or 1000ft; this 1inch = 1000ft equivalency is for the horizontal scale. The rendition of this topography as an isoline (contour) map from an overhead perspective is shown directly below. What is the term for the geologic feature called Carter Lake? If you were standing in the middle on the intermost contour line hill "c", your elevation would be. map. A contour interval is the vertical distance or difference in elevation between contour lines. B. Construct flow lines emanating from each point " x " to illustrate the groundwater flow field on the map. Step 2. slope of the area you are interested in by subtracting the lowest elevation There are fossils such as Glossopteris and Lystrosaurus that are found in rocks in South America and Africa that indicate they were part of Pangaea approximately 200 million years ago. Calculate the contour interval between index contours, which are are the more prominent, bold-colored lines with the elevation marked on them. In the above figure, the dark lines with reading are index contour lines. It is important for the farmer or irrigator to identify the slopes on the land. What approximate discharge would be associated with a 50 year recurrence interval? Is the church likely to be at risk of contamination from this same leak? If you trace the length of a line with your finger, each point you touch is the same height above sea level. Flood stage, or bankfull stage, on Sweetwater Creek occurs at a discharge of ~4,500 cfs. 12. S waves cant travel through liquids and this depth is where the liquid outer core exists. The calculation of the contour intervals is as below: Firstly locate 2 index contour lines that are labeled with a specific elevation. Observe the S wave velocities. Joyce McBeth; Karla Panchuk; Tim Prokopiuk; Lyndsay Hauber; and Sean Lacey, 1.3 GEOLOGY & RESOURCE MAPS FOR CANADIAN PROVINCES & TERRITORIES, 1-E1 LAB EXERCISES CANADIAN GEOLOGY & MINERAL AND ENERGY RESOURCES, 1-E2 LAB EXERCISES REGIONAL GEOLOGY & MINERAL AND ENERGY RESOURCES, 2-E1 LAB EXERCISES MINERAL IDENTIFICATION, 3.5 IGNEOUS ROCK FORMATIONINTRUSIVE VS. EXTRUSIVE, 3.6 LAB EXERCISES IGNEOUS ROCK IDENTIFICATION, 4-E1 LAB EXERCISES SEDIMENTARY ROCK IDENTIFICATION, 5.4 LAB EXERCISES METAMORPHIC ROCK IDENTIFICATION, 6.7 LAB EXERCISE CHOOSING ABSOLUTE DATING METHODS, Answers to Practice Lab Exercises in section 7-E1, 8.6 GEOLOGIC STRUCTURES CREATED BY PLASTIC & BRITTLE DEFORMATION, 8-E5 EXERCISES COMPLEX GEOLOGICAL MAPS & CROSS-SECTIONS, 9-E1 LAB EXERCISE LOCATING AN EPICENTER, 9-E3 LAB EXERCISE HISTORICAL EARTHQUAKE, 10.3 STREAM GRADIENT AND THE CYCLE OF STREAM EROSION, Introductory Physical Geology Laboratory Manual First Canadian Edition (v.3 Jan 2020), https://pub.data.gov.bc.ca/datasets/177864/pdf/092G/092G095.pdf, Next: Extra Practice Question on Topographic Maps, Introductory Physical Geology Laboratory Manual First Canadian Edition (v.3 - Jan 2020), Creative Commons Attribution-ShareAlike 4.0 International License. For Ex: If the number of lines between 2 index lines are 5. The given point, 537', therefore, must lie between the 520' and 540' contours (contours aand b). through a particular interval. Intervals involvinq the tonal centre, and their directions of movement -1 1 0 0 0 -1 0 1 0 0 -9 0 0 0 -8 1 0 0 -7 0 0 0 -6 . What is the tolerance for compression test results of concrete, according to the standards? 2.The contour interval is 0.025 N m 2.The thick black contour is zero. A contour interval is a vertical distance or a difference in elevation between contour lines in a topographic map, index contour lines are bold or thick lines that appear on every fifth contour line and if the number associated with specific contour lines is increasing, the elevation of the area is also increasing. 2. To take the difference, subtract the higher elevated line with the lower elevated line reading. Determine the direction of the slope (aspect) from the index contour line to your location by drawing an arrow from the index contour line to the next higher elevation contour line. Contour lines Lines or isolines on a map that connect points with the same elevation. Use a contour interval of 4 inches. Explain why. These circular patterns indicate hilltops, like in the diagram below (Figure 3.6). What does a contour interval mean - A contour interval is a vertical distance or the difference in the elevation between the two contour lines in a. . separating in cm/year? Sorry, you do not have permission to ask a question, You must log in to ask a question. Given that this portion of the Australian plate moves at a speed of 2.2 inches per year, how old are the snake fossils? which organism was the most useful in coming to this conclusion (best fossil index), which organism was the least useful in coming to this conclusion (worst index), how much of the parent isotope would be remaining after 7 half lives have passed, if a radiometric element has a half life of 425 yrs, how old would a rock be that only had 3.125% of the parent isotope remaining, based on your graph approximately how much of the parent isotope would be remaining after 3.5 half lives, based on your graph above approximately how many half lives have passed when only 35% of the parent isotope is remaining, an archeologist finds some cloth at a burial site and wants to determine the age of the remains. Thus, ais 520'; bis 540'. What is the latitude for the southeast corner of the map? The desired unit is feet. right hand portion of the window. Introductory Physical Geology Laboratory Manual First Canadian Edition (v.3 - Jan 2020) by Joyce McBeth; Karla Panchuk; Tim Prokopiuk; Lyndsay Hauber; and Sean Lacey is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License, except where otherwise noted. During the flood event of 9/23/2009, the discharge measured at this gaging station was 21,200 cfs. Write your answer in feet. The equation used is: Tips Measure in centimeters the distance (Map Length) between the two points you recorded in the previous question. What is the longitude for the Washington Monument, locate the base of the monument. The direction system is useful but imprecise. How to Calculate Contour Interval from Maps? (1 pt) Mount Price is located next to Garibaldi Lake (just west of Table Bay, Figure 7-E9 above). Q. If you decided to walk to from the monument to the white house how far would u have to walk in miles? contour lines represent steep slopes, conversely, contour lines that are spaced Location A is higher. shows the surface features, or topography of Earth or a certain area. Contour lines do not cross each other, divide or split. To illustrate what these hills look like in profile (or, how they would look if you saw them while standing on the ground and looking at them . A contour interval is a vertical distance or the difference in the elevation between the two contour lines in a topographical map. You can find out exactly how steep the What is the elevation of the unlabeled index contour crossing Roaring Creek in the northwest corner of the map? The shaded areas indicate the 95% confidence intervals. What type of drainage pattern would this area represent? They are usually mapped with large contour intervals. You will receive a link and will create a new password via email. fcontour (f) plots the contour lines of the function z = f (x,y) for constant levels of z over the default interval [-5 5] for x and y. fcontour (f,xyinterval) plots over the specified interval. Control of the body is accomplished by which of the following body systems? If you go from the river at (36 05 35.38 N 113 14 43.70 W) Straight up north the canyon rim What factors control the course of this river? 3. The contour interval is stated on every topographic map and is usually The distance between these areas is ~1.6 miles (measured along the curving distance of the non-magnified stream). Table of Contents and lab manual chapter pdf files for download, Overview of Canadian Geology and Mineral and Energy Resources, 4. (1 pt) Examining your map, you will see there is a black line that outlines a rectangle that takes up most of the map area. Why is mass so important to a stars life? Controls the size of characters in the contour labels; default is 0.08". the result from the nearest marked contour line. a) Label the elevation of every contour line on the map. The contour interval (height difference from one contour line to the next) on the 500 mb height map shown above is 3 decameters (abbreviated as 3 dam) or 30 meters (abbreviated as 30 m). Approximately how far did the pole move per day? Map Example The intervals +4tt and 4tt, then, respectively showed intervals ascending and descending from the tonal centre. This may be easier to determine by examining the tributaries to the main stream. According to your best fit line, what is the recurrence interval of such a discharge? Step 4. Of the following dated flood events, which one would you expect to happen more often? What is the approximate map relief? above or below it, multiplying by the contour interval, and adding or subtracting (1 pt) Find Deadmans Lake (it is located close to Cheakamus River and south of Daisy Lake; refer to Figure 7-E8 which is a close up from the map area). Observe the stream on the Omaha N, Nebraska-Iowa quadrangle. vertical scales on your topographic profile are not the same. for Interpreting Topographic Maps C. Submergence and deposition of sedimentary layers 10-13. Clear up mathematic tasks. Please enter your email address. Question 14. To illustrate what these hills look like in profile (or, how they would look if you saw them while standing on the ground and looking at them from a distance), you can draw what is known as a topographic profile. which Geologic Law did you use to come to the conclusion you made in the previous question? A contour interval is the vertical distance or difference in elevation between contour lines. 17. Be sure to only plot those elevations that are at the intersection of the contour line with line A-B. In Figure 9.7, what is the elevation of the lowest point in the crater? In Figure 9.4, what is the elevation of Malcome Bog? Gradient: Stream gradient can also be determined from a topographic What type of drainage does this appear to be? the boundary follows the course of the river at the time it was drawn, the river has since moved. An excerpt from a contour map is shown below. The following are general This page titled 3.6: Drawing Contour Lines and Topographic Profiles is shared under a CC BY-SA license and was authored, remixed, and/or curated by Deline, Harris & Tefend (GALILEO Open Learning Materials) . V shaped. What shape are the contour lines that cross a valley or stream? Indicators themselves are weak acids or weak bases. available from: Open Geosciences. maps also have a vertical scale to allow the determination of a point in three How were you able to come to this conclusion? What is the profile view to Topographic Map #1? 68 and south of the Edmonson County Line. along a line drawn through a portion of a topographic map. What is the area of the slab? b. What must be the maximum dry density of Granular Sub Base & Wet Mix Macadam used What is the Safe Bearing Capacity values for Different Soils? A. Contour the water table data, using a contour interval of 10ft. contour lines, the steeper the slope. Sensor stability as characterized through mean absolute differences (MARD) on every study day including only sensors inserted on study day 1. What is the relief of the area in the map? As you can see contour lines with 10 m interval. These same fossils can be found in Australia, which indicates it, along with Antarctica, was also part of Pangaea at that time. See example under CONTOUR/SPACING below. LAB EXERCISE 9.4 Rules for Reading Contour Li, LAB EXERCISE 9.3 Understanding Stream Behavio, LAB EXERCISE 11.2 The Logic of Locating Earth, EXERCISE 9.4: Determining Elevations From Top, LAB EXERCISE 2.10 - Estimating the Amount and, LAB EXERCISE 2.13 - Why Are There More Earthq, LAB EXERCISE 6.9 - Gaining Insight into Depos, EXERCISE 2.1 - Recognizing Plates and Plate B, Chapter 2: Understanding and treating mental, Fundamentals of Engineering Economic Analysis, David Besanko, Mark Shanley, Scott Schaefer. General Why does the boundary depart from the river channel? A thumbnail version of the map is shown in Figure 7-E7,a larger copy is provided at the back of this lab manual, and your TA will provide you with a full-scale version of the map in lab. 1 ft = 24,000 ft, and 24,000 ft x (\(\frac{1\;km}{3280\;ft}\)) = 7.32 km. (b) Why do you think reassociation to 1005 and 130 S particles did not work? Constructing a topographic map by drawing in contours can be easily done if a person remembers the following rules regarding contour lines: As you draw a contour line on a map you will notice that the elevations on one side of your line will be lower elevations, and elevations on the other side of your line will be higher elevations. Convergent (Continent-Ocean or Ocean-Ocean). Hint: draw a simple map or a rough cross-section sketch to help illustrate your logic. Which is the code used for the design of the RCC Bridge? Contour lines are used to show elevation on a topographic map. up or down from the nearest index contour line and multiplying by the contour Locate the state boundary between Nebraska and Iowa along the Missouri River. First, we must identify the two contours that lie on either side of "P." In some cases the contours that we need are clearly labeled; however, in other instances, you will need to use the contour interval (1,000 feet, in this case) to "count" up or down from a labeled contour.
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what is the contour interval for the figure below?