Hint- make sure to re-read the section on plate boundaries before answering! Q. This plate boundary isn't as simple as the previous examples, meaning another nearby plate boundary directly influences it. Contours make it possible to show the height and shape of mountains, the depths of the ocean bottom, and the steepness of slopes. 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). Considering the size of the area to be mapped, contour intervals are assumed. This content is subject to copyright. Refer to the figure below. 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). To determine the elevation of a point on a topographic map: The highest point of the rim of the crater is about 350. 14. The final answer we get after dividing is the contour interval of the specific topographical map. The equation used is: Tips Widely separated contour lines indicate a gentle slope. To calculate the vertical exaggeration in the topographic profile shown in Figure 3.6 we divide the horizontal scale by the vertical scale: (\(\frac{\frac{1000\;ft}{1\;inch})}{(\frac{100\;ft}{inch}}) = 10\). Math can be challenging, but with a little practice, it can be easy to clear up math tasks. What is the dc saturation current? The gradient of a steam or river is determined by measuring a section of If you examine the graph showing the topographic profile in Figure 3.6, can you imagine what would happen to your profile if we changed the spacing for elevations on the y-axis? example. For all of the following figures, assume north is at the top of the map, and south at the bottom. Measure the distance, using bar scale, between the pole in 1400 and 1500 (locations C and D). All points on a contour line are at the same elevation. In which direction does it flow? Slope Worksheet- Use the information from the example above and complete the slope worksheet. The figure above illustrates various topographic features. At 2900 Km the S wave velocity falls to 0. Write your answer in feet. Using the surrounding contour lines, what is the approximate elevation of Deadmans Lake? It is impossible to determine which location is higher. Please use Occams razor as you answer the questions: use the simplest explanation rather than the most complicated explanation to answer the question. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. A low relief. 30 seconds. It is thought to have formed by the runoff of either precipitation or groundwater. slope percent = (120ft / 1000ft) 100 = 12% Show your work below. Log in to TheConstructor to ask questions, answer peoples questions, write articles & connect with other people. Contour line art is a method of drawing where you draw only the outline of an object, without any shading. 0.5 in 24,000 in/in = 12,000 in Please draw he contour line of the given figure below using 1-meter interval and its index contour and Base on the contour lines that you draw in item no.24, what kind of topographic landform is represented? It is usually every fifth line that indicates a change in elevation. Use the topographic map (Fig. When we hold a ruler to the y-axis of the topographic profile in Figure 3.6, we see that 0.5 inches = 50ft, which means 1 inch = 100ft on the vertical scale. (b) Why do you think reassociation to 1005 and 130 S particles did not work? Refer to the figure below. How far apart are North America and Mainland Asia in cm? For the following exercises, please refer to British Columbia Topographic Map 092G095 of the Mount Garibaldi area in southern BC. Lay a strip map. Location A is higher. 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. Answer the following questions about these waypoints, based on your best guess estimate of the elevation of each waypoint. Contour lines that are close together show what type of slope? a stream or river and dividing the distance (in miles) into the vertical difference A contour interval is a vertical distance or difference in elevation between contour lines. the boundary follows the course of the river at the time it was drawn, the river has since moved. Please give your answer in grams/milliliter. d. Prepare a vertical S waves cant travel through liquids and this depth is where the liquid outer core exists. When connecting the points on your graph paper in the area between the two hills in Figure 3.6, you again want to round out the area to represent the base of your valley between the hills, but be careful not to make the valley floor too deep, as according to the topographic map the elevation is below 40ft, but not as low as 30ft. As you look at the map, notice that the contour The zone from 2900-5100 represents the Earth's ? To calculate this divide the distance (in centimeters) between the two islands by the difference in their ages, Examine the headings of the measurements that you took for the previous two questions. How fast was the Pacific plate moving during the last 1.1 million years between the formation of the Big Island and Maui in cm/year? Suppose that (x,y,z)=i+k\nabla \varphi(x, y, z)=\mathbf{i}+\mathbf{k}(x,y,z)=i+k. Comparable to figure 8 D-F in ref. Q: Refer to figure 23.5. What is the relief (difference in elevation) between Little Tomah Lake and the top of Tomah Mountain (look for "Tomah Mtn")? Lost your password? The lowest contour line is at 200m. as sinkholes, underlying soluble rock was dissolved and area collapsed. Examine the map below to answer the question. (b) Notice how a mountain saddle, a ridge, a stream, a steep area, and a flat area are shown with contour lines. The desired unit is feet. look at a map of the Sulphur-Boundary Creek area along the Middle Fork of the What does each contour line on a map show? If the arrow is pointing toward the contour lines around your location, your location is a higher elevation than the index contour line. On large-scale maps with a lot of topographical detail, the contour interval is usually smaller, while on small-scale maps with less detail, the contour interval is larger. Select the Q. It is south of Mammoth Cave. What is the dc collector resistance? B. Construct flow lines emanating from each point " x " to illustrate the groundwater flow field on the map. You will receive a link and will create a new password via email. Step 4. in Figure 9.4, what is the elevation of the intersection of U.S. Route 1 and Maine Route 6 in Topsfield? Contour Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. 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. How far is that distance (0.56 miles) in Kms? Sometimes vertical exaggeration is desiredbut, in some cases, you may not want it. This may be easier to determine by examining the tributaries to the main stream. each contour to the horizontal line of the same elevation. On this map, what is the change in elevation between two adjacent index contour lines? (10 pts) Imagine you are a geologist working for the Geological Survey of Canada. Vertical Point D is marked at 10,000 elevation and the next label is marked as 10,500 elevation. A thumbnail version of the map is shown in Figure 7-E10, 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. 2. Definition of Contour: A contour or a contour line may be defined as the line of intersection of a level surface with the surface of ground. Take that distance and divide it by the speed you calculated in question 3 to estimate when the next supercontinent will form. How is the top of a mountain shown on a topographic map? If you trace the length of a line with your finger, each point you touch is the same height above sea level. 9.4) to estimate the elevation of this point as accurately as possible. (5 pts) Construct a topographic profile for the map inFigure 7-E6 from position A to A on the graph paper provided in Figure 7-E6 below. Usually there are different contour intervals for the different maps. A profile may be constructed How far did the pole move? 500/10=50 in the southern portion of the map, the area is underlain by limestone. The speed the islands are sinking can be estimated by measuring the difference in elevation between two islands and dividing by the difference in their ages (this method assumes the islands were a similar size when they were active). which isotopic system should they use. First, subtract the lower number from the higher number and then divide the result by the number of contour lines. What Is Contour Interval? Low gradient and abundant sediment supply. C. Divide the current maximum elevation of the Big Island by the rate you calculated in the previous question. for Interpreting Topographic Maps 400 D. N a) point A 00 D. N a) point A b) point D c) point B d) point This is a graded activity, please submit it to your TA at the end of the lab. In the given figure contour interval is 50 feet. In every map, on the right-hand bottom side, the contour interval is specified. Contour Lines Both A and B (20-2900 Km and 2900-5100 Km). If the user enters 3.14 in response to the following programming statement, what will be stored in value? How are depressions marked on a topographic map? What happens when the lithosphere at point X is heated to 1500 C? Join now! 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. These circular patterns indicate hilltops, like in the diagram below (Figure 3.6). Go back to the location in Google Earth that you examined for question 36 (46 55 25.66 N 152 01 25.17 E). Likewise the "40" contour connects depths of 40 ft below sea level and so on. it shows natural features such as rivers and lakes. Is the church likely to be at risk of contamination from this same leak? Remember, because of isostasy the denser plate will be lower than the less dense plate. 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. 8,194,375 years to sink. Mathematically, a contour line is a curve in two dimensions on which the value of a function f (x, y) is a constant. 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? Note: elevation is metres above sea level; thus, sea level = ______ m. 2. In which stage of the cycle of stream erosion is this area? What type of plate tectonic boundary is at this exact location? The selection of the contour interval is decided by the survey leader before the start of the mapping process depending upon the ground factors. A contour interval is a vertical distance or the difference in the elevation between the two contour lines in a topographical map. 9. 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). on a topographic map base. None of these. - Table 8 . One side of a copper block 5cm5 \mathrm{~cm}5cm thick is maintained at 250C250^{\circ} \mathrm{C}250C. It is a plane section of the three-dimensional graph of the function f parallel to the-plane. Notice the tick marks pointing toward lower elevation. In which stage of the cycle of stream erosion is this area? If you were standing in the middle on the intermost contour line hill "c", your elevation would be. What is the physical state of a dry mantle rock at point X? Flood stage, or bankfull stage, on Sweetwater Creek occurs at a discharge of ~4,500 cfs. Legal. Axons from which neuron in the retina make up the optic nerve? What factors control the course of this river? Determine the height of Mount Price. Note: the maps used in this lab are in colour and the colours have significance in terms of the symbols and patterns used on the maps it is best to print this lab in colour and from a pdf version. Which of the following lakes has a shoreline that is most likely at an elevation between 10,240 and 10,320 feet above sea level? Inspect the P wave velocities. First, we compute the activation . Control of the body is accomplished by which of the following body systems? Figure 4: Reading Contour Maps . a view of the landscape as seen from above. See example under CONTOUR/SPACING below. 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). Of the following dated flood events, which one would you expect to happen more often? The number of lines obtained in the above step is taken and added with 1. The number of contour lines in-between 7000 and 7100 are 4. Explain how you made this decision. What do close contour lines represent on a map? To determine the %slope from Point A to Point B, the rise and run must first be determined. View Source. What bearing would you need to walk to go to the Smithsonian from the monument? Clear up mathematic tasks. A contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a topographical map. 8. nervous system and circulatory system endocrine and repertory system circulatory and respiratory systems nervous system and endocrine systems . In every map, on the right-hand bottom side, the contour interval is described. A topographic map may or may not include shaded relief to help visualize steep slopes. The small contour interval, the survey work and plotting have to be more accurate. exaggeration: Q. How far did the pole move in meters in one year during this time period? think about the drainage pattern you selected in the previous answer - what does this tell you about the underlying rocks? Given that San Francisco is located on the North American Plate and Los Angles is located on the Pacific Plate, are these two cities getting closer together or farther apart over time? any point by finding the nearest labeled line, counting the number of lines Gradient: Stream gradient can also be determined from a topographic Be sure to only plot those elevations that are at the intersection of the contour line with line A-B. We further visualize the globally normalized responses of each convolution filter on the image of grating interval 6 in Figure 5 B. A contour line is a line drawn on a topographic map to indicate ground elevation or depression. contour lines, the steeper the slope. If the counter interval is 10 feet, which hill (a,b,c) when viewed from the base is 40 feet tall? 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 . Approximately how far did the pole move per day? Location A is higher. The map has a contour interval of forty feet, For the plotting of region, the contour intervals are presumed. Now calculate the difference between the two-selected index contour line selected from a map. If the map has 40-foot contour intervals, then Point A is located at 3,000 feet, and Point B is located at 2,840 feet. From the contour map, a profile can be drawn of the terrain. 300 A. Write your estimates for the elevation at each waypoint next to the waypoint. (1 pt) Garibaldi Creek is located east of Deadmans Lake (Figure 7-E8). 1 ft = 24,000 ft, and 24,000 ft x (\(\frac{1\;km}{3280\;ft}\)) = 7.32 km. What is the area of the slab? Taking the area to be mapped, contour intervals are considered. Index contours are bold or thicker lines that appear at every fifth contour line. The rock that most closely resembles the composition of oceanic crust based on the description in the previous section is: Based on the choice you made for question 17, what is the density of the rocks that make up oceanic crust? Once your points are plotted on the graph paper, you simply connect the dots. a stream. Why? Do Pole movements seem to be steady every 100 years or variable? Vertical exaggeration is the effect that is created when the horizontal and 2. during a flood the river breached the natural levee flowing into the floodplain. Measure the horizontal map distance between points A and B to get the vertical ground distance. Why are colors and symbols used on topographic maps? When the vertical dimension of your graph is different from the horizontal dimension on your map, you may end up with a graph that shows a vertical exaggerationand the features of the Earth represented by your topographic profile may be deformed such as in Figure 3.7. Note: This lab is in colour. 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. What would happen to the mantle rock at point X if water is added to it? The horizontal distance between two points on two consecutive contour lines for a given slope is known as horizontal equivalent. Closer distance indicates steep slope and wider distance gentle slope. 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. 17. The run is 1000 feet and the rise in elevation is 120 feet. Scale (contour interval): All maps have a horizontal scale. 1. 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. Map Locate the Louisville and Nashville Railroad line just south of Hwy. The given point, 537', therefore, must lie between the 520' and 540' contours (contours aand b). The result is expressed in feet per mile (ft./mi.). Zoom out and examine the surrounding area, what geological hazards are likely in the area? In this stream, erosion is occurring on the ______________ because _______________, while deposition is occurring on, Cut banks, the fast velocity flows to this point; point bars the slowest velocity water flows to this point. What is the elevation of the base of the monument in meters? A mountaineer is planning an expedition. All contour lines are spaced at a 20 m contour interval. Refining interval counts to include these produced Figure 7 and - Table 8, below. What important discovery did the researcher miss? 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). If the river on this map is 1.93 miles long, what is the gradient for this river? Lakes/Ponds. Determine the elevation at Point A and Point B in the Figure 9 map below. Write your answer in feet. What type of tectonic plates are present? Step 2. 3. Use a contour interval of 4 inches. Practice Questions on Geological Structures, 7. shows the surface features, or topography of Earth or a certain area. Indicators themselves are weak acids or weak bases. 750m. 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 . Generally, there are various contour intervals for the various maps. These features you are seeing are linear valleys. Which is the code used for the design of the RCC Bridge? Contour lines do not cross each other, divide or split. f. Connect the of a hill (or hills). The numbered contour lines are the index contours; the unnumbered contour lines are the supplemental contours. How and why do we divide stars into groups by mass? Example 1- In the graphic below, what is the vertical distance between the contour lines? The vertical distance or difference in elevation between contour lines is known as a contour interval. The peak is normally considered to be located at half the interval distance. Sorry, you do not have permission to ask a question, You must log in to ask a question. The zone from 5100-6400 represents the Earth's ? (5 pts) The following topographic map (Map 7-E3) is from a coastal area and features an interesting geological hazard in addition to the ocean. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. 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. Using the speed you calculated in the previous question (and ignoring possible changes in sea level), when will the Big Island of Hawaii sink below the surface of the ocean? 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. Observe your best fit line. 10. Sensor stability as characterized through mean absolute differences (MARD) on every study day including only sensors inserted on study day 1. Chapter 3 Topographic Maps by Karen Tefend and Bradley Deline, CC BY-SA 4.0. These circular patterns indicate hilltops, like in the diagram below (Figure 3.6). interval. What direction is the North American plate moving in comparison to the Pacific Plate at this location? lowest line (which is 6760 feet, and not marked) has an elevation equal or greater What is the benchmark elevation at Sloans Crossing? 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\)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Answers to Practice Lab Exercises, Parts A and B, status page at https://status.libretexts.org, Contour lines represent lines connecting points of equal elevation above sea level, Contour lines never cross, split, or die off, Contour intervals must be obeyed, therefore the contour lineelevations can only be multiples of the contour interval.
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