slope percent = rise/run 100 Assume that water flowed through these valleys at some time. hillslope: (1 pt) Contour intervals located on this map are few and far between. 300 A. As you can see contour lines with 10 m interval. 3. Therefore, if you print it out in black and white please refer back to the electronic copy to avoid confusion. 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. Indicators themselves are weak acids or weak bases. which of the above geologic events is the seventh in the sequence? These circular patterns indicate hilltops, like in the diagram below (Figure 3.6). Set up the cancellation table so all units will cancel, except the desired unit, feet. The peak is normally considered to be located at half the interval distance. Contour values are in feet. shows the surface features, or topography of Earth or a certain area. The height of an object above the surface of the sea. 15. 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). 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 . Of the following dated flood events, which one would you expect to happen more often? a stream. interval. The difference in elevation between one contour line and the next. At 2900 Km the S wave velocity falls to 0. Note: there is technically more than one correct answer for some of these questions. Location B is higher. Choose the appropriate profile below. Please give your answer in grams/milliliter. for Interpreting Topographic Maps separating in cm/year? with the labeled contour lines at the bottom of the profile paper and project c. Label each mark To keep the contour map simple and easy to read, not every contour line is marked with its elevation reading. 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? as sinkholes, underlying soluble rock was dissolved and area collapsed. The small contour interval, the survey work and plotting have to be more accurate. 0.5 in 24,000 in/in = 12,000 in (1 pt) How much higher is Mount Price than Garibaldi Lake? which of the following is the best way to obtain an absolute date for the sequence of rocks, the geologist determines there is 78.3% of the parent remaining in the sample that they examine. What is the latitude for the southeast corner of the map? 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? Based on the assemblage of organisms (A-I) in this sample, what is the age of this rock? Generally, there are totally distinct contour intervals for various maps. Melodic contour is the shape and sequence of movements of a melodic line. It is determined as follows: Let's take an example of two contour lines which are labelled. Difference of annual-mean surface zonal wind stress (N m 2) computed as the simulation with flattened topography (FLAT) minus control (ALL) from ref. A simple diagram is shown below on the left. In Figure 9.4, what is the elevation of the highest point on Farrow Mountain? trend up valleys and form a "V" or a "U" where they cross From the contour map, a profile can be drawn of the terrain. 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. Question 14. These marked or labeled lines are known or termed as Index Contour Lines. 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? 2.The contour interval is 0.025 N m 2.The thick black contour is zero. Scale: Maps come in a variety of scales, covering areas ranging from What is the latitude on the northern edge of this rectangle? 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. Your contour lines will generally fall between the GPS points on your map, so you will need to estimate many of the contour line positions. Both A and B (20-2900 Km and 2900-5100 Km). They are marked with short, straight lines inside the circle. The desired unit is feet. What does each contour line on a map show? Where do the P waves abruptly change? Refer to Problem 14.1 for guidance. 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. Given that this portion of Pangaea broke apart 200,000,000 years ago, calculate how fast South America and Africa are The steepest slope on this hill can be found on the side that is facing which direction? Closer distance indicates steep slope and wider distance gentle slope. of paper along a line across the area where the profile is to be constructed. 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 . (5 pts) 7. You can find out exactly how steep the Horizontal Location B is higher. Contour line art is a method of drawing where you draw only the outline of an object, without any shading. 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. (1 pt) Mount Price is located next to Garibaldi Lake (just west of Table Bay, Figure 7-E9 above). a. Answer: B. A topographic map may or may not include shaded relief to help visualize steep slopes. 16. map. 18. Practice questions on Topographic Maps, 5. D) Nothing. They are usually mapped with small contour intervals. 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. backward or by clicking on the arrows above and below the eye in the upper How fast was the Pacific plate moving from 7.2 million years ago to 4.7 million years ago between the formation of Kauai and Nihoa in cm/year? Chapter 3 Topographic Maps by Karen Tefend and Bradley Deline, CC BY-SA 4.0. This may be easier to determine by examining the tributaries to the main stream. Would this be an easy location to maintain a railroad? How is the top of a mountain shown on a topographic map? 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? Write out the longitude for each designated point as was done for Point A Write out the longitude for each designated point as was done for Point A A: Longitudes for the given points are explanied below The direction of plate movement in the last 1.1 million years. If the counter interval is 10 feet, which hill (a,b,c) when viewed from the base is 40 feet tall? Table of Contents and lab manual chapter pdf files for download, Overview of Canadian Geology and Mineral and Energy Resources, 4. What feature(s) can you observe south of Hwy. (1 pt) Garibaldi Creek is located east of Deadmans Lake (Figure 7-E8). B. Construct flow lines emanating from each point " x " to illustrate the groundwater flow field on the map. (1 pt) Explain in a sentence how a ratio scale works. 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? a view of the landscape as seen from above. 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. What is Contour Interval? For producing a detailed study of What type of drainage does this appear to be? What is the change in elevation across each contour interval (i.e., between successive "regular" contours) on this map? All points on a contour line are at the same elevation. According to your best fit line, what is the recurrence interval of such a discharge? The highest point on a topographic map is marked as 345m. Make sure to zoom out to get a good view of the relevant features. slope percent = (120ft / 1000ft) 100 = 12% Put simply, contour lines mark points of equal elevation on a map. To show information. A person standing at point "F" would only be visible to a person standing at: Examine the figure below. A contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a topographical map. A standard topographic map uses contour linesto express elevations above sea level and show the shape of the land. Why would a smaller ratio scale be used for this map in comparison to the Garibaldi map? Example 1- In the graphic below, what is the vertical distance between the contour lines? If you trace the length of a line with your finger, each point you touch is the same height above sea level. The more closely spaced the When you join you get additional benefits. Which of the three proposed plate tectonic mechanisms would NOT occur at this location? These features you are seeing are linear valleys. . Lay a strip (1 pt) What is the longitude along the eastern edge of this rectangle? The calculation of the contour intervals is as below: Firstly locate 2 index contour lines that are labeled with a specific elevation. In the above figure, the dark lines with reading are index contour lines. in the southern portion of the map, the area is underlain by limestone. They then cross the stream and turn back along the opposite bank of the stream forming a "v". First, we compute the activation . 8,194,375 years to sink. along a line drawn through a portion of a topographic map. What happens when the lithosphere at point X is heated to 1500 C? USask GEOL 121 Lab Final Exam Overview. What is the tolerance for compression test results of concrete, according to the standards? Step 1. Contour tops of peaks, and some are marked with xs with numbers next to them. Comparable to figure 8 D-F in ref. This means every point on a contour line has the same altitude as that of the assumed intersecting surface. 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. 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. General -- - . It is usually shown in or near the map's legend. Each contour line shows a different elevation. Example 4- What is the slope percent in Exercise 2 above? 225 feet; half the contour interval lower than 250 feet. Contour plots with Excel and Matplotlib Select the XYZ data arranged as a single range (Range I4:N8 in the data screenshot below). The headings indicate the direction the Pacific Plate is moving over the hot spot. Contour lines do not cross each other, divide or split. Locate the Louisville and Nashville Railroad line just south of Hwy. Possible contours include 500', 520', 540', 560', 580', 600', 620', etc. As you look at the map, notice that the contour The number of lines obtained in the above step is taken and added with 1. 2. 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? Topographic In Figure 9.4, what is the elevation of the highest point on Hunt Ridge (keep in mind step #4 from the first question)? For example, if you wanted to do a contour line drawing of a pear, you'd simply draw the outline of the pear, add a stem, and stop there. She could find, in sedimentation experiments on bacterial lysates, not only 30S,50s30 \mathrm{~S}, 50 \mathrm{~s}30S,50s, and 70S70 \mathrm{~S}70S particles but also some particles that sedimented at about 100S100 S100S and 1305. What can be said about level surfaces of \varphi? Lines or isolines on a map that connect points with the same elevation. Sorry, you do not have permission to ask a question, You must log in to ask a question. As a rule, hilltops will be slightly rounded to show a slight increase in elevation to represent the crest of the hill, but be careful not to draw the hilltoptoo high on your graph paper. The Zone from 0-20 km represents the earths? Use the slope percent equation and solve. If you were standing in the middle on the intermost contour line hill "c", your elevation would be. In what general direction is the Pacific Plate moving? Location A is higher. Contour lines that are very close together indicate a steep slope. The intervals +4tt and 4tt, then, respectively showed intervals ascending and descending from the tonal centre. Figure 2 is the cross section along line AB. What is the relationship between the relief of an area and the contour interval on a map of he area? Controls the size of characters in the contour labels; default is 0.08". 200 feet. 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? Observe the velocities of waves on the graph. If the numbers associated with the contour lines are decreasing, there is a decrease in elevation. Legal. 1. during a flood the river breached the natural levee flowing into the floodplain. Join TheConstructor to ask questions, answer questions, write articles, and connect with other people. S waves cant travel through liquids and this depth is where the liquid outer core exists. available from: Open Geosciences. Terms and conditions apply. On our map, point "P" lies between 3000 feet and 4000 feet contours . What approximate discharge would be associated with a 50 year recurrence interval? What does each contour line on a map show? Lakes/Ponds. 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). For example, the first hill on the left has a top contour line of 50ft. First, subtract the lower number from the higher number and then divide the result by the number of contour lines. o drainage ' divide or watershed boundary 1000 ft -::-:: Contour interval 50 Feet Figure 12.5 Flow lines across a topographic surface. What do close contour lines represent on a map? What bearing would you need to walk to go to the Smithsonian from the monument? Go back to the location in Google Earth that you examined for question 36 (46 55 25.66 N 152 01 25.17 E). 3. It is important for the farmer or irrigator to identify the slopes on the land. Practice Questions on Geological Structures, 7. 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. A red "X" in Figure 9.5 marks a spot on a contour line along the shore of Baskahegan Lake, but the printed DEM doesn't say anything about its elevation. a geologist is trying to date a sequence of sedimentary rocks with abundant fossils and sandstones. To calculate this divide the distance (in centimeters) between the two islands by the difference in their ages. The following are general An incredible app, hundreds of features for every kind of math, and the best part is that it shows u what to do on each step and it explains each step, and, very little ads. An excerpt from a contour map is shown below. from the highest, and dividing the result by the horizontal distance. Therefore: Rise = change in elevation = top (Point A elevation) minus bottom (Point B . f. Connect the Mark These same fossils can be found in Australia, which indicates it, along with Antarctica, was also part of Pangaea at that time. Please enter your email address. 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. 10. (Answer to the nearest foot.) Give the elevation of the highest and lowest contour lines as well as the difference between them. The Contour Interval of the above map us 20 Units. What type of plate tectonic boundary is at this exact location? Log in to TheConstructor to ask questions, answer peoples questions, write articles & connect with other people. Point D is marked at 10,000 elevation and the next label is marked as 10,500 elevation. Country For 1:25 000 scale maps the interval between contours is usually 5 metres, although in mountainous regions it may be 10 metres. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. According to the geothermal gradient, rocks buried 75 km beneath the surface would normally be at what temperature? Step 2. through a particular interval. It will take approx. Contour lines make a v pattern as they cross streams and rivers, and the v always points towards the upstream direction. What important discovery did the researcher miss? USask GEOL 121 Rock & Mineral Quiz Information, 8. It is impossible to determine which location is higher. d. Is the elevation of waypoint D > or < waypoint C? If you go from the river at (36 05 35.38 N 113 14 43.70 W) Straight up north the canyon rim The zone from 2900-5100 represents the Earth's ? The terms below which isotopic system should they use. Contour lines Considering the size of the area to be mapped, contour intervals are assumed. The contour lines in this figure are equally spaced. Contour intervals must be obeyed, therefore the contour line elevations can only be multiples of the contour interval . Use the appropriate conversion factor to convert the horizontal map distance to horizontal ground distance. Follow the creek along its path. scale on profile paper by labeling the horizontal lines corresponding to the How far is that distance (0.56 miles) in Kms? How to Calculate Contour Interval from Maps? 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). How and why do we divide stars into groups by mass? refers to height in feet, or meters, above sea level). TAs names: _______________ _______________. Adjacent means next to. In which stage of the cycle of stream erosion is this area? How old is the burial site? What features would you expect to occur at this type of boundary? Based on your answer to question 6 which of the following statements about the break-up of Pangaea is TRUE? What would cause two separate samples of pure water to have slightly different pH\mathrm{pH}pH values? What is the approximate map relief? Using the contour lines, determine the upstream direction of the creek. What type of tectonic plates are present? The result is expressed in feet per mile (ft./mi.). So contour interval = 790 m-780 m=10 m. For further query, add a comment. (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? To avoid having your profile distorted so that it accurately conveys what the surface of the Earth really looks like in profile, you will want both the vertical and horizontal scales to match. What Is Contour Interval? The difference between adjacent contour lines. Then, find the difference in elevation between the two points. 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. Flood stage, or bankfull stage, on Sweetwater Creek occurs at a discharge of ~4,500 cfs. fault. A profile may be constructed 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. above or below it, multiplying by the contour interval, and adding or subtracting a landform it is necessary to construct a topographic profile or cross-section 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 . Answer the following questions about these waypoints, based on your best guess estimate of the elevation of each waypoint. The even spacing indicates the hill has a uniform slope. What are the different types of handrails used in bridges? Mountain/Hill Depressions Lets assume, 7000 and 7100 and calculate the interval between it. 6. he areas enclosed by contour lines at 5 m interval for a reservoir upto the face of the proposed dam are as shown below value of Contour lines 100,510l0,1015,1020,1025,1030,1035 Area (m2) 653/2 ,653, 653*2, 653*8, 653*18 ,653*25 , 653*40 Taking 1005m and 1035 m as the bottom most level and the highest water level achievable of the reservoir. Step 4. The commonly used contour interval is 20 feet for a 1:24,000 map scale. 14. with the elevation of the contour it represents. Orbiting spacecraft contain internal gyroscopes that are used to control their orientation. Large contour interval is to be used if the time available for the survey work is less. maps also have a vertical scale to allow the determination of a point in three The difference between Contour intervals and Horizontal Equivalent are tabulated below: Contour Lines and Its Types, Characteristics and Uses in Surveying. 12. (2 pts) What is the relief on this map? They also show some features made by people such as brodges. 9.4) to estimate the elevation of this point as accurately as possible. 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 type of process is going on at this location? Measure the horizontal map distance between points A and B to get the vertical ground distance. A contour line is a line drawn on a topographic map to indicate ground elevation or depression. If oceanic and continental crust collided, based on their densities the __________ crust would sink below the ________crust. Line 1 starts with the contour interval, not the projection point. He wants to follow the easiest possible path, which means he needs to find the most gentle slope up the mountain. It is usually every fifth line that indicates a change in elevation. Suppose that (x,y,z)=i+k\nabla \varphi(x, y, z)=\mathbf{i}+\mathbf{k}(x,y,z)=i+k. Learn more about how Pressbooks supports open publishing practices. 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. Index contours increase by 250. exaggeration: Map Example indicate what information is contained on a topographic map, and where it can 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. The difference in elevation between the highest and lowest points in the area on the map. Is the school likely to be at risk of contamination from this same leak? Stream Zoom out and examine the area, what other type of boundary is nearby? None of these. Write your answer in feet. Assume value is an integer variable. Explain why. right hand portion of the window. The final answer we get after dividing is the contour interval of the specific topographical map. Write your estimates for the elevation at each waypoint next to the waypoint. Determining please add a brief explanation thank you For the plotting of region, the contour intervals are presumed. 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.
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