Desert Landforms Name Section PROBLEMS-PART III The following questions are base
ID: 295121 • Letter: D
Question
Desert Landforms Name Section PROBLEMS-PART III The following questions are based on Map T-10, the “Furnace Creek, California" quadrangle (scale 1:62,500; contour interval 80 feet; dotted lines represent 20-foot contours). This portion of the Furnace Creek quadrangle shows the Panamint Range and the western side of Death Valley in Death Valley National Park (36919'08"N, 116°53'25"W). Several large alluvial fans can be seen along the eastern front of the Panamint Range. The basin floor here is called the Death Valley "salt pan," because salts have accumulated here in great thicknesses 1. (a) What is the lowest elevation shown on the basin floor? (b) What is the highest elevation shown in this part of the Panamint Range? feet (c) What is the local relief shown on the map? feet 2. () 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.) feet (b) Why is the basin floor so flat? 3. Suggest and explain a reason why 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 Range 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 irregular (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 238Explanation / Answer
1 a. -49ft
b.3689ft
c.3738ft
2 a.160ft
b.the basin isnso flat because the river has reached the mature stage of erosion.so there are flat lands and alluvial plains,moreover the drainge density must have been very high and alot of erosion would have caused lowering of relief.
3.This is because in trail canyon alluvial fan the alluvial fan is formed from nearer to the mountain or highest elevation so much amount of sediment is there and while alluvial in north have origin of sediment from much lesser elevation or slope so less amount of deposit lesser the slope of fan.
4. The fan is getting alot of deposit since the mountains are at greater elevations so change in slope of fan may cause zigzag or fanspread causes zigzag lines.
5.325ft