Please answer the high school geography contour questions in detail

The area is controlled by the southeast trade winds, and the contour curve on the left is the Andes, which shows that A is in the leeward break, B is on the top of the mountain, C is in the basin, and D is on the windward slope, and the precipitation is the most abundant).

The smaller the scale, the larger the actual range represented. The contour distance is the same, the larger the actual range, the slower the slope, so choose the small scale a).

At the same scale, the steeper the slope is. Therefore, choose d).

There are 4 spacings between the contour lines, and the spacing represents 50 meters, so the cliff height must be greater than 200 meters and less than 300 meters).

The river in the figure originates from the mountain range in the south and flows to the north, and it is preliminarily determined that the topography in the map is about high in the south and low in the north, and at the northernmost point, of course, it is the lowest, separated by 7 contour lines, separated by 6 contour lines, and separated by 4 contour lines, and the highest terrain can be seen to be ).

It is located at the exit of the pocket terrain, the terrain on both sides of the bank is narrow, the water level changes rapidly, and the amount of construction of the reservoir is small).

The topographic areas through which the line passes are, in order: saddle, valley, mountain, valley, valley, valley, large mountain range).

Question 3 c

The elevation of PQ is 100 meters, and the contour distance in the contour map is certain, and the contour line under the bridge is only 50 meters, so the height difference range is 50 to 100.

Question 4 B The river is developed in a valley, and the contour line of the valley is characterized by the value from low to high, and the river flow direction is opposite to the contour convex direction, as shown in the figure, it is not difficult to see that the river flows from right to left. A and C are located in the lower reaches of the river, and D is located on the northeast side of the saddle, both of which are impossible, and the only possible is B, where the pesticide migrates with the river water.

This question is the reading of the topographic map of the examination room and the content of the valley ridge The place where the contour line protrudes from the height is called the valley The valley is also called the catchment line The water for agricultural irrigation flows down from the valley So there are pesticide residues Just find out where the valley is.

The altitude of A is 50, and the circle next to 100 is clearly a mountain peak, and A is between two mountains, so A is in the saddle of the mountain, excluding A.

The contour line where B is located protrudes towards an altitude of 100 elevations, and B is a valley, so B is chosen

Observing the four places A, B, C and D, only the contour line of B is from high to low, and only in this way will the water flow from above to under the bridge.

The question has been told to the left is.

There are four contour lines, the difference is 100m, and the h is either 200m or 300m. But it doesn't matter much to solve this problem.

The difference from H to B is a full 100, and to A is 200, but there is no contour between A and town, indicating that the height difference from A to town is less than 100m, between (0,100).

Therefore, the relative height from h to the town is 200 and the answers are rather peculiar, only 1m difference. Very puzzling.

If you are still unsure about my answer, I recommend asking the teacher.

The river is regarded as the lowest point, 0m, and the town is in the position of the river impact plain, which must be less than 300m, and only c is suitable for the elimination method. Although it is not certain whether h is greater than 299m.

h ground on the contour line, 300 meters high. When the height of the town is the smallest h is the largest, and the height of g is 0, so the height range of the town is between 0 and 100, so when the height of the town is infinitely close to 0, the h value is infinitely close to 300, and you need to find the H that is less than 300 and the largest

Point P is 810-820 m above sea level and point Q is 860-870 m above sea level. The maximum height difference (relative height) between the two points is close to 60 meters, but less than 60 meters, so choose C

As can be seen from the figure, the contour distance is 10 meters, and the height of point P should be: the maximum possible height difference between 810m should be the maximum possible height of point Q minus the minimum possible height of point P, that is, 870-810 = 60m

The minimum height difference is the minimum possible height of point q minus the maximum possible height of point p, i.e., 860-820 = 40m

Get 40 so the "maximum height difference" should be c...

The p-point is about 815

The Q-point is about 865

So choose B

I would also like to use the second floor as an example of a mudslide. Actually, flash floods or something, it's pretty much the same.

Generally, escape in a direction perpendicular to the flow of the mudslide. Don't run in the direction of the mudslide, no matter how fast we run, we can't outrun the mudslide. Debris flow is a special torrent of landslides and carrying a large amount of sediment and stones, to put it bluntly, it is a flash flood + sand and gravel.

Belch... Off topic.

The contour line is low and the convex height is low, which can judge the direction of the debris flow, and is not necessarily determined by the density of the contour line.

In addition, if the slope is perpendicular to the debris flow to both sides, one side of the contour line is dense, and the other side of the contour line is sparse, generally choose the sparse one, because the slope is too steep to climb, of course, the premise is to judge according to the height difference of the contour line.

The most important thing is that you should never choose the line that crosses the mudslide, and if you do, you may become a part of the mudslide.

1) Basins. 2) A (reason: the contour line at B is sparse, the A is dense, the height difference is large at the dense place, and the water flow is turbulent).

3) protection of vegetation and afforestation; Forest.

4) f: Submerge cultivated land and resettle migrants.

1) Basin (2) Rainfall (3) Afforestation, planting fruit trees. (4) e flooding of farmland, villages.

Basin, A,。。 Do it yourself, and the little ones should study hard.