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? C. Why does the boundary depart from the river channel? Divide the current maximum elevation of the Big Island by the rate you calculated in the previous question. pressing down on the middle mouse wheel and moving the mouse forward and It is determined as follows: Let's take an example of two contour lines which are labelled. First Edition. 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. Measure the distance using the bar scale between the pole 1400 and 1700 (locations C and F). A profile may be constructed Axons from which neuron in the retina make up the optic nerve? Forests across much of the United States are becoming denser. Contour interval calculator - A contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a. . To show different features of Earth's surface. Figure 2 is the cross section along line AB. If you were standing in the middle on the intermost contour line hill "c", your elevation would be. Considering the map, the following steps are used to calculate the contour intervals calculation as follows . Why are colors and symbols used on topographic maps? If the counter interval is 10 feet, which hill (a,b,c) when viewed from the base is 40 feet tall? Select the Closer distance indicates steep slope and wider distance gentle slope. 200 feet. a) Label the elevation of every contour line on the map. How old is the burial site? exaggeration: Assume that water flowed through these valleys at some time. Contour lines separating in cm/year? 250/5 = 50. Where does it wind up? Once your points are plotted on the graph paper, you simply connect the dots. Why is this so? What type of tectonic plates are present? Difference of annual-mean surface zonal wind stress (N m 2) computed as the simulation with flattened topography (FLAT) minus control (ALL) from ref. British Columbia Topographic Map 092G095. Locate Little Sinking Creek in the southern portion of the map, north of Hwy. How far did the pole move? A rounded contour indicates a flatter or wider drainage or spur. (Answer to the nearest foot.) A map has index contours at 250m, 500m, and. What type of tectonic plates are present? These features you are seeing are linear valleys. e. Place the paper A simple diagram is shown below on the left. Q. You will receive a link and will create a new password via email. elevation of each index contour line. 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. What is the term for the geologic feature called Carter Lake? Contour Lines To keep the contour map simple and easy to read, not every contour line is marked with its elevation reading. 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). Then, find the difference in elevation between the two points. From the contour map, a profile can be drawn of the terrain. On which date did a flood event have a recurrence interval of 0.5? located below the scale. Indicators themselves are weak acids or weak bases. Each contour line shows a different elevation. available from: Open Geosciences. Control of the body is accomplished by which of the following body systems? . What would happen to the mantle rock at point X if water is added to it? Assume value is an integer variable. Of the following dated flood events, which one would you expect to happen more often? backward or by clicking on the arrows above and below the eye in the upper What is the relief between the surface of East Musquash Lake and the intersection between U.S. Route 1 and Maine Route 6 in Topsfield? Likewise the "40" contour connects depths of 40 ft below sea level and so on. Refining interval counts to include these produced Figure 7 and - Table 8, below. Lets assume, 7000 and 7100 and calculate the interval between it. Which of the three proposed plate tectonic mechanisms would NOT occur at this location? How far did the pole move? The difference between two adjacent contours is called the contour interval, which is 10 ft for the Figure 2-2 example. Be sure to only plot those elevations that are at the intersection of the contour line with line A-B. If oceanic and continental crust collided, based on their densities the __________ crust would sink below the ________crust. What color shows buildings, bridges and railroads? The. What does each contour line on a map show? What does this type of drainage pattern indicate about the area? The numbered contour lines are the index contours; the unnumbered contour lines are the supplemental contours. Convergent (Continent-Ocean or Ocean-Ocean). 50m. (1 pt) What is the ratio scale of this map? Salmon River This map is a geologic map of glacial geology in the area, drawn If the arrow is pointing toward the contour lines around your location, your location is a higher elevation than the index contour line. Vertical which Geologic Law did you use to come to the conclusion you made in the previous question (figure 1.8)? 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). Note: elevation is metres above sea level; thus, sea level = ______ m. 2. Pick two contour lines that are next to each other and find the difference in associated numbers. 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. What type of drainage pattern is present in this area? In this case, to find out the intermediate points elevation, contour intervals are used. Dont forget to add a contour line to the map legend! Step 3. examine the unconformity shown in figure 1.10. what type of unconformity is this? How far have the snake fossils moved apart since they were originally deposited? If you trace the length of a line with your finger, each point you touch is the same height above sea level. Q: Refer to figure 23.5. Every sixth contour line has an index contour, which is a bolder or thicker line. BIOMEDICINE: Digestive System | Description o. What does each contour line on a map show? In the early days of ribosome research, before the exact role of ribosomes was clear, a researcher made the following observation. When she treated such a mixture with EDTA, everything dissociated to 30S30 \mathrm{~S}30S and 50s50 \mathrm{~s}50s particles. Low gradient and abundant sediment supply. Index contours are bold or thicker lines that appear at every fifth contour line. The map has a contour interval of forty feet, A contour map consists of contour lines of a given geographical region. of a hill (or hills). For small contour interval, the money required will also more as the field and office work will be more. slope of the area you are interested in by subtracting the lowest elevation 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. on a map that are produced from connecting points of equal elevation (elevation Inspect the P wave velocities. 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 horizontal distance between two points on two consecutive contour lines for a given slope is known as horizontal equivalent. 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. What approximate discharge would be associated with a 50 year recurrence interval? What is the tolerance for compression test results of concrete, according to the standards? Location A is higher. Locate the Louisville and Nashville Railroad line just south of Hwy. C. Submergence and deposition of sedimentary layers 10-13. Its Calculation, Uses and When it is Required, Factors Affecting the Selection of Contour Interval. The number of contour lines in-between 7000 and 7100 are 4. Because the stream flows south, contour a, which lies downstream of contour b, must be the lower of the two. A topographic map is a precise, graphic representation of the three-dimensional shape of the earth's surface. far apart represent gentle slopes. 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The difference between adjacent contour lines. Use the index contour just above the "m" in Temple Canyon for your initial spot. Choose the appropriate profile below. Lighter contour lines do not have elevations, but can be determined by counting The highest point on a topographic map is marked as 345m. Step 2. In Figure 1.9, which of the following geologic structures is. 2009-2021 The Constructor. think about the drainage pattern you selected in the previous answer - what does this tell you about the underlying rocks? The purpose of this lab is to familiarize students with how to read and use topographic maps. Learn more about how Pressbooks supports open publishing practices. What is the dc collector resistance? 2.The contour interval is 0.025 N m 2.The thick black contour is zero. You can figure out the elevation of The commonly used contour interval is 20 feet for a 1:24,000 map scale. Example 2- Draw a profile showing the elevations of the contours. (1 pt) What is the longitude along the eastern edge of this rectangle? vertical scales on your topographic profile are not the same. 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). (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. 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) . Set up the cancellation table so all units will cancel, except the desired unit, feet. The older unconformity is a Nonconformity, while the younger is a Disconformity. Using the contour lines, determine the upstream direction of the creek. In the above figure, the dark lines with reading are index contour lines. Contour line art is a method of drawing where you draw only the outline of an object, without any shading. The rendition of this topography as an isoline (contour) map from an overhead perspective is shown directly below. below cuts the mountain at equal intervals of elevation. Approximately how far did the pole move per day? If you were standing at the washington monument what direction would you need to walk to get to the U.S. capitol building? 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. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. What is the relationship between the relief of an area and the contour interval on a map of he area? Upon adding divalent ions, she could regain 70S70 S70S particles, but never 1005 or 1305 particles. Please refer to this Saskatoon topographic map to complete the next three questions. 1 What is the contour interval on this map? 7. (in feet) between the two points. Scale (contour interval): All maps have a horizontal scale. 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? The number of lines obtained in the above step is taken and added with 1. You want to have the y-axis of the graph paper represent the elevations of the contour lines that intersect your drawn line (line A-B in this case). Widely separated contour lines indicate a gentle slope. The height of an object above the surface of the sea. Considering the size of the area to be mapped, contour intervals are assumed. So contour interval = 790 m-780 m=10 m. For further query, add a comment. If the counter interval is 10 feet, which hill (a,b,c) when viewed from the base is 40 feet tall? 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. 14. What type of tectonic plates are present? The following are general hillslope: What type of bedrock is present in this area? lowest line (which is 6760 feet, and not marked) has an elevation equal or greater Contour lines that are close together show what type of slope? Line 1 starts with the contour interval, not the projection point. A. The zone from 20-2900 Km represents the earth? The direction system is useful but imprecise. The distance between these areas is ~1.6 miles (measured along the curving distance of the non-magnified stream). Give the elevation of the highest and lowest contour lines as well as the difference between them. 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? 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. 19. Slope Worksheet- Use the information from the example above and complete the slope worksheet. how old is the sequence of rocks. 3. Answer the following questions about these waypoints, based on your best guess estimate of the elevation of each waypoint. Betwe View the full answer Transcribed image text: What is the contour interval for the figure below? Map Example Refer to the figure below and assume contour interval of 10 feet. In what direction was the main river flowing? topographic profiles: Remember that topographic maps represent How contour lines show a pair of small hills Look closely at the topography south of highway, and it changes abruptly. What can be said about level surfaces of \varphi? In which stage of the cycle of stream erosion is this area? 15. refers to height in feet, or meters, above sea level). To solve a math problem, you need to figure out what information you have. Observe the S wave velocities. 9. Notice the general shape of this feature. The numbers are the elevation at the top of the peak. In every map, on the right-hand bottom side, the contour interval is specified. Which of the following places represent a Wadati-Benioff zone? At 500 degrees Celsius, rocks will be buried to about _______ km depth. 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 . Sorry, you do not have permission to ask a question, You must log in to ask a question. In most maps, every fifth contour line is an index contour. What is the latitude on the northern edge of this rectangle? The run is 1000 feet and the rise in elevation is 120 feet. Now calculate the difference between the two-selected index contour line selected from a map. How far is that distance (0.56 miles) in Kms? For consistency, assume that elevations between contour lines are 1/2 a contour interval higher than elevation of the lower line. (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. The headings indicate the direction the Pacific Plate is moving over the hot spot. Transcribed image text: Orbiting spacecraft contain internal gyroscopes that are used to control their orientation. Mountain/Hill Depressions This means every point on a contour line has the same altitude as that of the assumed intersecting surface. 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 B. Construct flow lines emanating from each point " x " to illustrate the groundwater flow field on the map. In which direction does it flow? 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? 3. 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 overview section 7.4.2 provides useful background to help you answer questions 4 & 5. What factors control the course of this river? Topographic Math can be challenging, but with a little practice, it can be easy to clear up math tasks. How far (in Km) did the pole move in one year during this time period? Log in to TheConstructor to ask questions, answer peoples questions, write articles & connect with other people. The gradient of a steam or river is determined by measuring a section of Generally, there are various contour intervals for the various maps. In a large map, index contour lines are less to keep it simple to read the map easily. In what general direction is the Pacific Plate moving? The difference between Contour intervals and Horizontal Equivalent are tabulated below: Contour Lines and Its Types, Characteristics and Uses in Surveying. The desired unit is feet. 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. If you were standing in the middle on the intermost contour line hill "c", your elevation would be. Explain why. On our map, point "P" lies between 3000 feet and 4000 feet contours . fault. during a flood the river breached the natural levee flowing into the floodplain.
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what is the contour interval for the figure below?