Geography Laboratory Manual EXERCISE 45 PROBLEMs-PART III The following question

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Geography Laboratory Manual EXERCISE 45 PROBLEMs-PART III The following questions are based on Map T-1o. the "Fumace Creek, California quadrangle 162.500 contour so feet lines epresent 20 contours). This porti Fumace Creek quadrangle shows the Panamint Range and the western side of Death Valley in Death Park (36 19 08 N. large alluvial fans can be seen along Valley National basin floor here is called the Death Valley "salt the eastem front of the Panamint Range. The pan," because salts have accumulated here in great thicknesses. I. (a) What is the lowest elevation shown on the basin noor? b) What is the highest elevation shown in this part of the Panamint Range? (c) What is the local relief shown on the map? 2. (a) What is the maximum change in elevation (either up or down) you would experience along the basin floor traveling due south, from Section 9 to the bottom of the map? (Supplementary 20-foot contours are shown with dotted lines.) Why is the basin floor so (b) 3. Suggest and explain a reason wh the Trail canyon alluvial fan and the alluvial fan just to the north are so different in size. 4. Find "Trail Canyon" coming out of the Panamint ange in the center of the map (a dirt road is shown coming down the fan of Trail Canyon). Why are the contours showing the Trail Canyon alluvial fan so imegular (many tiny zigzags)? (Hint: What surface features of the fan are these zigzags showing?) 5. How deep is the gully cut by the ephemeral stream (shown with a dashed blue line) that flows down the Trail Canyon alluvial fan where it crosses the "sea level" contour at the bottom of the fan? (You can estimate the depth of a valley or gully on a slope by compar- ing the size of the "V" in the contour line to the overall spacing of contour lines on that slope. For example, if the V extends up to the position of the next higher contour line on the slope, the valley is about one contour interval deep; if it extends halfway to the next higher contour line, the valley is about one-half contour interval deep, and so on.) feet deep 314 copyright o 20n Pouvon Education,

Explanation / Answer

1.a)The lowest elevation shown in the map is =20feet

b)The highest elevation shown is =80feet

c)The local relief can be estimated as the point between the lowest and the highest elevation=50feet

2.a)The maximum change which can be experienced while moving south along with a supplementary of 20feet=maximum elevation-supplemetary

=80-20=60feet

b)The basin floor is flat because the water continuously erodes the surface and does not allow any kind of deposits to stay back on the surface. Hence the floor is flat.

3.Both the alluvial fans are different in shape and size and this is due to the continuous erosion in one place and dry weather in other place which takes up the water availability from the soil does causing a change in its physical structure.

4.As discussed before,the alluvial fan is irregular in structure due to continuous erosion by the moving waves which washes some of the soil content or sometimes brings out new deposits to settle in that area. The zigzag paths indicate the to and fro flow of the washing waves.

5.The depth the gully is cut by the stream can be approximately equal to 20-30feet and this is estimated because the lowest elevation can be best suited for the gully depth as both lie on the same plane.

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