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In Map E. CI= 20ft. Answer: a) How many closed depressions can you count on that map? ......................... b) How many hills can you count on that map? .........................

In Map E. CI= 20ft. Answer: a) How many closed depressions can you count on that map? ......................... b) How many hills can you count on that map? .........................

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
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In Map E. CI= 20ft. Answer:
a) How many closed depressions can you count on that map? .........................
b) How many hills can you count on that map? ......................... 

Characteristics of Contours Learning to read contour maps effec- tively is not an easy task. Nature has few lines reminiscent of contour lines, and the visualization of a three- dimensional surface represented only by contours requires careful study and practice. After some training, however, you should be able to visualize the landscape represented by a contour map. You will obtain more quantitative information from a contour map than from any other type of map or image. The following basic rules will help you get started: 1500 A. The difference in elevation between adja- cent contours is constant on any given map and is referred to as the contour interval, or CI. The most frequently used contour interval on 72-min and 15-min quadrangles is 20 ft. 1600 180 B. Contour lines trend up a valley, cross the stream, and extend down the valley on the opposite side. The lines thus form a V pattern, with the apex of the V pointing upstream. 400 300 C. Contours never cross or divide. They may appear to merge to express a vertical cliff, but in reality they are stacked one on top of another and only appear to touch. The spac- ing of contour lines reflects the gradient, or slope. Closely spaced contours slopes. Contours spaced far apart represent gentle slopes. -7000- sent steep 6500 D. Hills and knobs are shown as closed contours. E. Closed depressions (basins without outlets) are shown by closed contours with hachures (short lines) pointing downslope. FIGURE 7.10 Characteristics of Contour Lines 90 006/ 004
Transcribed Image Text:Characteristics of Contours Learning to read contour maps effec- tively is not an easy task. Nature has few lines reminiscent of contour lines, and the visualization of a three- dimensional surface represented only by contours requires careful study and practice. After some training, however, you should be able to visualize the landscape represented by a contour map. You will obtain more quantitative information from a contour map than from any other type of map or image. The following basic rules will help you get started: 1500 A. The difference in elevation between adja- cent contours is constant on any given map and is referred to as the contour interval, or CI. The most frequently used contour interval on 72-min and 15-min quadrangles is 20 ft. 1600 180 B. Contour lines trend up a valley, cross the stream, and extend down the valley on the opposite side. The lines thus form a V pattern, with the apex of the V pointing upstream. 400 300 C. Contours never cross or divide. They may appear to merge to express a vertical cliff, but in reality they are stacked one on top of another and only appear to touch. The spac- ing of contour lines reflects the gradient, or slope. Closely spaced contours slopes. Contours spaced far apart represent gentle slopes. -7000- sent steep 6500 D. Hills and knobs are shown as closed contours. E. Closed depressions (basins without outlets) are shown by closed contours with hachures (short lines) pointing downslope. FIGURE 7.10 Characteristics of Contour Lines 90 006/ 004
3:32 PM Thu Nov 11 * 62% Lab-8 ONLINE TopoContour lines.pdf 8. Closed lines with hachures, short lines pointing toward the centers of the closures (i.e. pointing downslope), represent closed depressions Closed depression (e.g. lake or the dry lake) 9. When contour line crosses the river valley, it curves (V-es) upstream along the bank to continue connecting the same elevations, because the central part of the valley is lower than the banks. downstream (downhill) HW-Questions: 1. Below, on the copy from the Hamblin & Howard's Lab book (p. 87-90, in old edition p. 81,82) calculate Contour Interval (CI) for Fig 10 B, C, D Calculation of the Contour interval example: Fig10, A: CI = (1600ft - 1500ft)/ 5intervals = 100ft/5=20ft %D %3D Мар В: CI= Мар С: Cl= Маp D: CI= In Map E. Cl= 20ft. Answer: a) How many closed depressions can you count on that map? b) How many hills can you count on that map? dimensional surface represented only by contours requires careful study and map. You will obtain more quantitative information from a contour map than Characteristics of Contours Learning to read contour maps effec- neaetiee A fter ceme teainina henser from an other tune of ma n er imaae Dashboard Calendar To Do Notifications Inbox 000
Transcribed Image Text:3:32 PM Thu Nov 11 * 62% Lab-8 ONLINE TopoContour lines.pdf 8. Closed lines with hachures, short lines pointing toward the centers of the closures (i.e. pointing downslope), represent closed depressions Closed depression (e.g. lake or the dry lake) 9. When contour line crosses the river valley, it curves (V-es) upstream along the bank to continue connecting the same elevations, because the central part of the valley is lower than the banks. downstream (downhill) HW-Questions: 1. Below, on the copy from the Hamblin & Howard's Lab book (p. 87-90, in old edition p. 81,82) calculate Contour Interval (CI) for Fig 10 B, C, D Calculation of the Contour interval example: Fig10, A: CI = (1600ft - 1500ft)/ 5intervals = 100ft/5=20ft %D %3D Мар В: CI= Мар С: Cl= Маp D: CI= In Map E. Cl= 20ft. Answer: a) How many closed depressions can you count on that map? b) How many hills can you count on that map? dimensional surface represented only by contours requires careful study and map. You will obtain more quantitative information from a contour map than Characteristics of Contours Learning to read contour maps effec- neaetiee A fter ceme teainina henser from an other tune of ma n er imaae Dashboard Calendar To Do Notifications Inbox 000
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