On which date did a flood event have a recurrence interval of 0.5? 3. By using a ruler, you can transfer these elevation points from your topographic map straight down onto your graph paper such as shown in Figure 3.6. The numbered contour lines are the index contours; the unnumbered contour lines are the supplemental contours. Contour interval: The change in elevation from one contour line to the next is always the same within the same map.Many maps have either a 40- or 80-foot contour interval: An 80-foot interval simply means that each contour line is 80 vertical feet away from . If oceanic and continental crust collided, based on their densities the __________ crust would sink below the ________crust. The contour music definition is the same definition in any medium such as visual art,. maps also have a vertical scale to allow the determination of a point in three Step 4. View the full answer. vertical scales on your topographic profile are not the same. The Contour Interval of the above map us 20 Units. The zone from 5100-6400 represents the Earth's ? Map The terms below What type of tectonic plates are present? Contour lines never cross. Considering the map, the following steps are used to calculate the contour intervals calculation as follows . What are the different types of handrails used in bridges? The contour interval is 20'. Overview section 7.3 provides background information on contour lines to prepare you for these exercises. slope percent = rise/run 100 which of the above geologic events is fifth in the sequence. In every map, on the right-hand bottom side, the contour interval is described. o drainage ' divide or watershed boundary 1000 ft -::-:: Contour interval 50 Feet Figure 12.5 Flow lines across a topographic surface. Use the slope percent equation and solve. Take that distance and divide it by the speed you calculated in question 3 to estimate when the next supercontinent will form. Dont forget to add a contour line to the map legend! Please give your answer in grams/milliliter. To solve a math problem, you need to figure out what information you have. b. slope percent = rise/run 100. Follow the creek along its path. Large contour interval is to be used if the time available for the survey work is less. elevation of each index contour line. Would you expect the gradient of the Missouri River in Nebraska to be greater or less than the gradient that you calculated for the Grape River in Colorado? For small contour interval, the money required will also more as the field and office work will be more. The peak is normally considered to be located at half the interval distance. Refer to the figure below. How were you able to come to this conclusion? Melodic contour is the shape and sequence of movements of a melodic line. (5 pts) 7. Show your work below. Where does it wind up? nervous system and circulatory system endocrine and repertory system circulatory and respiratory systems nervous system and endocrine systems . (The benchmarks have an "x" to locate the spot where the elevation was surveyed). This plate boundary isn't as simple as the previous examples, meaning another nearby plate boundary directly influences it. Line 1 starts with the contour interval, not the projection point. They also show some features made by people such as brodges. Was Carter Lake cut off before or after the state boundary between Nebraska and Iowa was drawn? Map Example it shows natural features such as rivers and lakes. for Interpreting Topographic Maps Want to create or adapt books like this? What type of drainage pattern would this area represent? What happens when the lithosphere at point X is heated to 1500 C? Stream channels radiate outwards like wheel spokes from a high point. 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. up or down from the nearest index contour line and multiplying by the contour In which direction does it flow? Mark What is the tolerance for compression test results of concrete, according to the standards? Australia and Antarctica separated after the break-up of Pangaea. Comparable to figure 8 D-F in ref. Scale (contour interval): All maps have a horizontal scale. Refer to Problem 14.1 for guidance. 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. For example, if a location point is between the 150 feet and 200 feet contour lines than the elevation is 175 feet (1/2 of 50 feet is 25 feet; 25 feet added to 150=175 feet). Axons from which neuron in the retina make up the optic nerve? Examine the map below to answer the question. The lowest contour line is at 200m. 300 A. A contour is a line drawn on a map that joins points of equal height above sea level. Please use Occams razor as you answer the questions: use the simplest explanation rather than the most complicated explanation to answer the question. 18. Location B is higher. Use the topographic map (Fig. 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. For the following exercises, please refer to British Columbia Topographic Map 092G095 of the Mount Garibaldi area in southern BC. Likewise the "40" contour connects depths of 40 ft below sea level and so on. which means that every place between the marked 6800 foot line and the next If you were standing in the middle on the intermost contour line hill "c", your elevation would be. Based on the drainage pattern type, does the bedrock underlying this area consist of rocks uniformly resistant to erosion or rocks alternating between resistant and non-resistant layers? 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. Usually there are different contour intervals for the different maps. At 500 degrees Celsius, rocks will be buried to about _______ km depth. They are usually mapped with large contour intervals. Practice questions on Topographic Maps, 5. Step 1. Absolutley amazing app and would definitely recommend. The elevation at sea level is zero meters. Does your topographic profile show any peaks or valleys? Closer distance indicates steep slope and wider distance gentle slope. 31. The selection of the contour interval is decided by the survey leader before the start of the mapping process depending upon the ground factors. Set up the cancellation table so all units will cancel, except the desired unit, feet. Index contours are bold or thicker lines that appear at every fifth contour line. Given that this portion of the Australian plate moves at a speed of 2.2 inches per year, how old are the snake fossils? 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 . 250/5 = 50. B. Calculate how fast the Hawaiian Islands are sinking, by using the ages and elevations of Maui and Nihoa. 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. 40 feet - 20 feet = 20 feet The direction system is useful but imprecise. Assume that water flowed through these valleys at some time. Contour lines are used to show elevation on a topographic map. Considering the size of the area to be mapped, contour intervals are assumed. (Hint: Speed= Distance/Time). Write your answer in feet. which of the above geologic events is seventh in the sequence. Join now! All Rights Reserved. A topographic map may or may not include shaded relief to help visualize steep slopes. the boundary follows the course of the river at the time it was drawn, the river has since moved. In Figure 1.9, which of the following geologic structures is. Index contours are bold or thicker lines that appear at every fifth contour line. 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? Among other things, a topographic map can be used to measure the average slope We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. 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. Pick two contour lines that are next to each other and find the difference in associated numbers. What is the gradient of the GC, What is the contour interval for the map below, Between the index counters on this map, the river gradient is. each contour to the horizontal line of the same elevation. Explain how you made this decision. e. Place the paper A slope is easy to recognize in a hilly area. Why is this so? Now count the number of non-index lines contour lines between the 2 index contour lines selected for the contour interval calculating in the 1st step. It will take approx. Hint: draw a simple map or a rough cross-section sketch to help illustrate your logic. Index contours are bold or thicker lines that appear at every fifth contour line. In what general direction is the Pacific Plate moving? Once your points are plotted on the graph paper, you simply connect the dots. Lighter contour lines do not have elevations, but can be determined by counting 15. 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. It is impossible to determine which location is higher. 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? as sinkholes, underlying soluble rock was dissolved and area collapsed. Overview section 7.3 provides background information on contour lines to prepare you for these exercises. The circled points indicate days that were at least partially spent at the study side; red circles indicate days with frequent sampling . Contour lines make a v pattern as they cross streams and rivers, and the v always points towards the upstream direction. See example under CONTOUR/SPACING below. What does each contour line on a map show? The Wadati-Benioff zone is associated with which type of plate boundary? Observe the S wave velocities. Answers: 1 Show answers Another question on Biology. 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. During the flood event of 9/23/2009, the discharge measured at this gaging station was 21,200 cfs. . Would the recurrence interval for this flood plot at: Is it possible that a flood with a similar discharge to that of the event from 9/23/2009 could happen again in the next 20 years? refers to height in feet, or meters, above sea level). above or below it, multiplying by the contour interval, and adding or subtracting Math can be challenging, but with a little practice, it can be easy to clear up math tasks. separating in cm/year? 46, black arrow). 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. For example, the first hill on the left has a top contour line of 50ft. during a flood the river breached the natural levee flowing into the floodplain. You can find out exactly how steep the If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. Which is the code used for the design of the RCC Bridge? The intervals +4tt and 4tt, then, respectively showed intervals ascending and descending from the tonal centre. What is the dc collector resistance? in Figure 9.4, what is the elevation of the intersection of U.S. Route 1 and Maine Route 6 in Topsfield? Sometimes vertical exaggeration is desiredbut, in some cases, you may not want it. For the plotting of region, the contour intervals are presumed. If you go from the river at (36 05 35.38 N 113 14 43.70 W) Straight up north the canyon rim Use the appropriate conversion factor to convert the horizontal map distance to horizontal ground distance. Salmon River This map is a geologic map of glacial geology in the area, drawn 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 . The Grand Canyon is an extraordinarily steep area. Figure 3. If the relief is high (bigger change) you will need a bigger contour interval. 400 D. N a) point A 00 D. N a) point A b) point D c) point B d) point A higher contour interval is used for a large area and small contour interval for small area. 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? Put simply, contour lines mark points of equal elevation on a map. Figure 2 is the cross section along line AB. The older unconformity is a Nonconformity, while the younger is a Disconformity. long-term time-average of sea level). What do close contour lines represent on a map? 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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. What important discovery did the researcher miss? on the paper the exact place where each contour, stream and hill top crosses 68 and south of the Edmonson County Line. USask GEOL 121 Rock & Mineral Quiz Information, 8. To use the same interval for both x and y , specify xyinterval as a two-element vector of the form [min max]. The purpose of this lab is to familiarize students with how to read and use topographic maps. For all of the following figures, assume north is at the top of the map, and south at the bottom. How big is the base (area) of the washington monument in sq feet? Of the following dated flood events, which one would you expect to happen more often? For a relief map the contour interval is frequently persistent. Please hand in this lab to your TAs at the end of the lab period. In which zone do the P wave velocities appear to be steadily increasing? Mark Figure 7-E9 with a line to indicate the distance you used in your calculation. The headings indicate the direction the Pacific Plate is moving over the hot spot. If so, what are the corresponding highest and lowest elevations? Contour intervals must be obeyed, therefore the contour line elevations can only be multiples of the contour interval . For small scale maps covering a wide area of varying terrain, For rough topographical map meant for initial assessment only, If a detailed map is to be prepared for execution work, If the ground has large variation in levels, for instance, hills and ponds, No measurement or scaling is required since the contour levels are indicated on the contour lines, The distance must be measured on the map and converted to actual distance by multiplying with the scale of the map, In a given map the contour interval is a constant, The horizontal equivalent varies with slope. Contour Lines On our map, point "P" lies between 3000 feet and 4000 feet contours . In Figure 9.4, what is the elevation of Malcome Bog? fault. Which one travels faster? For Ex: If the number of lines between 2 index lines are 5. Look closely at the topography south of highway, and it changes abruptly.