a geologist is trying to date a sequence of sedimentary rocks with abundant fossils and sandstones. Determining d. Is the elevation of waypoint D > or < waypoint C? 2. Contour Lines: Contour lines are used to determine elevations and are lines on a map that are produced from connecting points of equal elevation (elevation refers to height in feet, or meters, above sea level). As an example, elevation of each index contour line. Calculate how fast the Hawaiian Islands are sinking, by using the ages and elevations of Maui and Nihoa. 2009-2021 The Constructor. tops of peaks, and some are marked with xs with numbers next to them. 750m. 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. A profile may be constructed Widely separated contour lines indicate a gentle slope. Map Example Q. indicate what information is contained on a topographic map, and where it can Here two contour line, side by side are 790 m and 780 m. Between them there is no contour line. Example 2- Draw a profile showing the elevations of the contours. 200 feet. Where do the S wave velocities abruptly change? Are the rocks likely tilted and folded or horizontal? What type of plate tectonic boundary is at this exact location? Join now! which Geologic Law did you use to come to the conclusion you made in the previous question? 10. Contour Lines and Intervals Contour lines connect all the points on a map that have the same elevation and therefore reveal the location of hills, mountains, and valleys. To take the difference, subtract the higher elevated line with the lower elevated line reading. 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. Observe your best fit line. In which stage of the cycle of stream erosion is this area? a) Label the elevation of every contour line on the map. What is the latitude for the southeast corner of the map? Its Calculation, Uses and When it is Required, Factors Affecting the Selection of Contour Interval. Write your answer in feet. In every map, on the right-hand bottom side, the contour interval is described. 40 feet - 20 feet = 20 feet 19. 2. On our map, point "P" lies between 3000 feet and 4000 feet contours . Be sure to only plot those elevations that are at the intersection of the contour line with line A-B. 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). Step 3. To show different features of Earth's surface. When she treated such a mixture with EDTA, everything dissociated to 30S30 \mathrm{~S}30S and 50s50 \mathrm{~s}50s particles. Lets assume, 7000 and 7100 and calculate the interval between it. Explain how you made this decision. This may be easier to determine by examining the tributaries to the main stream. All Rights Reserved. Put simply, contour lines mark points of equal elevation on a map. Each dot represents an elevation number, spaced evenly at 100 m in the horizontal. Measure the gradient to the index contour past the word Creek (the last contour before it reaches Arkansas River). Locations A and B are at the same elevation. Please give your answer in grams/milliliter. Line 1 starts with the contour interval, not the projection point. Considering the size of the area to be mapped, contour intervals are assumed. which isotopic system should they use. Measure the distance, using bar scale, between the pole in 1400 and 1500 (locations C and D). which of the above geologic events is fifth in the sequence. 2. 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) . c. Label each mark 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? Figure 3. Once your points are plotted on the graph paper, you simply connect the dots. 2.The contour interval is 0.025 N m 2.The thick black contour is zero. 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? Refer to the topographic map in Figure 7-E3 for an example of contour lines you can use to help you complete this question. Every sixth contour line has an index contour, which is a bolder or thicker line. Find Sloans Crossing. f. Connect the In what general direction is the Pacific Plate moving? it shows natural features such as rivers and lakes. hillslope: According to your best fit line, what is the recurrence interval of such a discharge? Gradient: Stream gradient can also be determined from a topographic The difference in elevation between one contour line and the next. What bearing would you need to walk to go to the Smithsonian from the monument? A topographic map may or may not include shaded relief to help visualize steep slopes. According to the geothermal gradient, rocks buried 75 km beneath the surface would normally be at what temperature? At 75 km depth, rocks will be heated to about _______ degrees Celsius. An error message is displayed. Mark Figure 7-E9 with a line to indicate the distance you used in your calculation. Example 4- What is the slope percent in Exercise 2 above? USGS topographic maps also show many other kinds of geographic features including roads, railroads, rivers, streams, lakes, boundaries, place or feature names, mountains, and much more. Contour values are in feet. Slope Worksheet- Use the information from the example above and complete the slope worksheet. located below the scale. In what direction was the main river flowing? Note: if you are unable to read the contours on the map, view the original map on the web or look at the large printed copy in the lab. A contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a topographical map. 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. We further visualize the globally normalized responses of each convolution filter on the image of grating interval 6 in Figure 5 B. Q. This means every point on a contour line has the same altitude as that of the assumed intersecting surface. Absolutley amazing app and would definitely recommend. Location B is higher. Legal. Pick two contour lines that are next to each other and find the difference in associated numbers. As a contour approaches a stream, canyon, or drainage area, the contour lines turn upstream. Salmon River This map is a geologic map of glacial geology in the area, drawn Note: This lab is in colour. A topographic profile is a cross-sectional view C. Submergence and deposition of sedimentary layers 10-13. maps also have a vertical scale to allow the determination of a point in three Select a countryland IslandsAfghanistanAlbaniaAlgeriaAndorraAngolaAnguillaAntarcticaAntigua and BarbudaArgentinaArmeniaArubaAustraliaAustriaAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelauBelgiumBelizeBeninBermudaBhutanBoliviaBonaire, Saint Eustatius and SabaBosnia and HerzegovinaBotswanaBouvet IslandBrazilBritish Indian Ocean TerritoryBritish Virgin IslandsBruneiBulgariaBurkina FasoBurundiCambodiaCameroonCanadaCape VerdeCayman IslandsCentral African RepublicChadChileChinaChristmas IslandCocos (Keeling) IslandsColombiaComorosCongo (Brazzaville)Congo (Kinshasa)Cook IslandsCosta RicaCroatiaCubaCuraaoCyprusCzech RepublicDenmarkDjiboutiDominicaDominican RepublicEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEthiopiaFalkland IslandsFaroe IslandsFijiFinlandFranceFrench GuianaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuatemalaGuernseyGuineaGuinea-BissauGuyanaHaitiHeard Island and McDonald IslandsHondurasHong KongHungaryIcelandIndiaIndonesiaIranIraqIsle of ManIsraelItalyIvory CoastJamaicaJapanJerseyJordanKazakhstanKenyaKiribatiKuwaitKyrgyzstanLaosLatviaLebanonLesothoLiberiaLibyaLiechtensteinLithuaniaLuxembourgMacao S.A.R., ChinaMacedoniaMadagascarMalawiMalaysiaMaldivesMaliMaltaMarshall IslandsMartiniqueMauritaniaMauritiusMayotteMexicoMicronesiaMoldovaMonacoMongoliaMontenegroMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNetherlands AntillesNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorth KoreaNorwayOmanPakistanPalestinian TerritoryPanamaPapua New GuineaParaguayPeruPhilippinesPitcairnPolandPortugalQatarRepublic of IrelandReunionRomaniaRussiaRwandaSo Tom and PrncipeSaint BarthlemySaint HelenaSaint Kitts and NevisSaint LuciaSaint Martin (Dutch part)Saint Martin (French part)Saint Pierre and MiquelonSaint Vincent and the GrenadinesSan MarinoSaudi ArabiaSenegalSerbiaSeychellesSierra LeoneSingaporeSlovakiaSloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia/Sandwich IslandsSouth KoreaSouth SudanSpainSri LankaSudanSurinameSvalbard and Jan MayenSwazilandSwedenSwitzerlandSyriaTaiwanTajikistanTanzaniaThailandTimor-LesteTogoTokelauTongaTrinidad and TobagoTunisiaTurkeyTurkmenistanTurks and Caicos IslandsTuvaluUgandaUkraineUnited Arab EmiratesUnited Kingdom (UK)United States (US)UruguayUzbekistanVanuatuVaticanVenezuelaVietnamWallis and FutunaWestern SaharaWestern SamoaYemenZambiaZimbabwe, By registering, you agree to the Terms of Service and Privacy Policy .*. 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. The difference between Contour intervals and Horizontal Equivalent are tabulated below: Contour Lines and Its Types, Characteristics and Uses in Surveying. 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. Follow the creek along its path. Step 3. Orbiting spacecraft contain internal gyroscopes that are used to control their orientation. Q. It is a plane section of the three-dimensional graph of the function f parallel to the-plane. 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? In which stage of the cycle of stream erosion is this area? Calculate the contour interval between index contours, which are are the more prominent, bold-colored lines with the elevation marked on them. Index contours are bold or thicker lines that appear at every fifth contour line. 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. The height of an object above the surface of the sea. Taking the area to be mapped, contour intervals are considered. Set up the cancellation table so all units will cancel, except the desired unit, feet. Based on the map below, which location has a greater elevation, A or B? (Answer to the nearest foot.) The highest point on a topographic map is marked as 345m. 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. What type of bedrock is present in this area? fairmount. Large contour interval is to be used if the time available for the survey work is less. Location B is higher. The rendition of this topography as an isoline (contour) map from an overhead perspective is shown directly below. Therefore the topographic profile in Figure 3.6 represents a profile of the map surface (along the A-B line) that has been vertically exaggerated by 10 times (10X). Figure out math tasks Determine Contour Interval and Contour Line Values. which of the above geologic events is the seventh in the sequence? shows the surface features, or topography of Earth or a certain area. What is the profile view to Topographic Map #1? What is Contour Interval? The lowest contour line is at 200m. topographic profiles: Remember that topographic maps represent Notice the general shape of this feature. Sorry, you do not have permission to ask a question, You must log in to ask a question. What is the contour interval? A mountaineer is planning an expedition. A darker, heavier contour line that is labeled with an elevation. b. 31? A. Contour the water table data, using a contour interval of 10ft. 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. Use the topographic map (Fig. A standard topographic map uses contour linesto express elevations above sea level and show the shape of the land. Please refer to this Saskatoon topographic map to complete the next three questions. Lighter contour lines do not have elevations, but can be determined by counting Q. The contour interval is 20'. What do close contour lines represent on a map? available from: Open Geosciences. It is usually shown in or near the map's legend. Overview section 7.3 provides background information on contour lines to prepare you for these exercises. The older unconformity is a Nonconformity, while the younger is a Disconformity. think about the drainage pattern you selected in the previous answer - what does this tell you about the underlying rocks? (2 pts) What is the relief on this map? View the full answer. slope percent = (120ft / 1000ft) 100 = 12% 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?