High School Geography Questions Analysis Why are the answers to the two questions different What is

The key is the concept of three distances: [travel distance]; [Latitude distance]; Longitude distance and equatorial symmetry

The length of the parallels is different, and the length of the meridians (the equator is the longest of them) is equal, and according to this basic principle [Draw a line on a globe], you will find that: the figure drawn in the first question is a geometric figure that completely coincides with the graticule (a spherical symmetrical figure with the equator as the axis of symmetry); The figure drawn in the second question does not exactly coincide with the graticule. (The latitude of the Southern Hemisphere is relatively high, and the longitude range of 100 km is larger than that of 30 km north of the equator in the Northern Hemisphere).

There are different answers to this question: first, if the point is at a latitude of 100 kilometers north and south of the equator, it is back to the starting point; 2. Return to the west of the starting point in the northern hemisphere and east of the starting point in the southern hemisphere.

The test point of the problem is that due east and west walk along the circle of latitude, and one of the characteristics of the latitude line is that the closer to the equator, the greater the spacing, for example, starting from a (30 degrees north latitude, 120 degrees east longitude), due south and then at b (about 28 degrees north latitude——— because the latitude was 111 kilometers, now roughly calculated as 100 kilometers, 120 degrees east longitude), and then due east to c (about 28 degrees north latitude, about 122 degrees east longitude - one degree of latitude is calculated as 111 * cos latitude,)

Further north to d (30 degrees north latitude, about 122 degrees east longitude) and then due west to e (30 degrees north latitude, about 119 degrees east longitude) The crux of the problem is that due east and west walk along the circle of latitude, and one of the characteristics of the parallels is that the closer they are to the equator, the greater the spacing, and due south and north follow the meridian - this has no effect).

The first question is that the length of the north and south parallels is equal, and the meridians do not need to be considered, so you can reach the origin point if you go on like this; The second question, because 30 kilometers north of the equator is longer than 70 kilometers south of the equator, so that from the same meridian to the east, it is obvious that the shorter latitude is easterly.

The starting point of the second question is 30 kilometers north of the equator, and after 100 kilometers to the south, it is 70 kilometers south of the equator. Since the earth is a spherical surface, 30 kilometers and 70 kilometers away from the equator, the latitude is different, so although it has traveled 100 kilometers to the west and east, the relative position is different, that is, the longitude of the crossing is different, so it is impossible to return to the original point. And the first question, after 50 kilometers to the south, is located 50 kilometers south of the equator, so that the latitude is the same, and you can return to the original point.

Starting from 50 kilometers north of the equator, walk 100 kilometers due west, south, east, and north in turn, which is exactly about the symmetry of the equator.

I think the answer to question 6 of the netizen upstairs is incorrect.

India's climate is predominantly tropical monsoon, with a large area of rice cultivation and is one of the major rice-growing countries in the world. Although Brazil has a large area of tropical rainforest climate and savannah climate, most of the land in Brazil is cultivated with tropical cash crops, and the area under rice cultivation in Brazil is very small.

The correct answer to this question should be B, India and Brazil both have relatively large steel industries. Northeast India is the main distribution area of India's steel industry, and Brazil's steel industry is mainly located along the southeast coast, with large iron ore mines nearby.

CBC Figure 1 is Brazil and Figure 2 is India. In the first question, both countries are developing countries, and in the second question, Brazil has a tropical rainforest climate, and India has a tropical monsoon climate. It's all hot and rainy.

In this last question, Brazil is second only to India in rice production.

B The answer is wrong is that it is located on the top of the mountain, and it is not wrong to hide the ancient temples in the deep mountains, but the ancient temples are mostly distributed on the mountainside, and from the contour map, this ancient temple is located on the top of the mountain, and the risk of development increases, and it is susceptible to various natural disasters.

The answer is wrong in the general waterfall is that the drop is relatively large, or the contour line coincides that is a steep cliff, but there is no contour line overlap in the figure, and the graduality of the drop is also relatively strong, so the possibility of developing the whitewater waterfall is relatively small.

The answer is wrong, the dangerous shoal canyon should be distributed in an area with a relatively large drop, with mountain peaks on both sides and rivers passing through the middle, such as the Yarlung Zangbo River Grand Canyon, or the Three Gorges are typical examples. However, the drop here is relatively small, and the possibility of developing dangerous shoals and canyons is relatively small.

Answer: The lake and mountains are beautiful, the surrounding altitude is more than 800 meters, and there are lakes at the top of the mountain, and there are lakes at the bottom of the mountain, plus the surrounding environment, so it is the main direction of tourism.

In addition, from the perspective of tourism development, it can also be understood that BCD is just a project for sightseeing. This is purely a personal opinion.

Question 8 should be D.

a Lake and mountains - from the map, it seems that the lake is not very large.

b Yougu Tibetan Temple - the ancient temple in the picture is on the top of the mountain, more than 1,000 meters, presumably not a "hidden valley".

c Rapids Waterfall - From the contour line, there is no cliff or the like, and the waterfall will not be formed.

d Dangerous Canyon - At the place where the river exits the mountain pass, according to the principle of "convex high, low contour", there should be three canyons, and the rivers converge into lakes, indicating that the water flow is gentle, and there should be tidal flats accordingly.

To sum up, I think D should be chosen.

bThe reason for this is that the temple is on a hill, and not in a valley.

The rivers and lakes are all in the valley, the terrain is low, and there will be no rapids and rapids, and the valley terrain is 400, and the terrain is gentle.

d As can be seen from the contour lines, it is concave inward, it is a valley, and the contour lines are dense.

Question 8: Let's choose B.

The valley here is only cosmetic, it doesn't matter if it's a real valley or not

BC is definitely not right One is the top of the mountain One is not a cliff A seems to be a small lake Choose D.

You can only see question 8The answer is b.

Reason: A comprehensive reading of the picture shows that the [lake] in the picture is just a small pool, and it is obviously inappropriate to use the theme of "lakes and mountains"; The catchment area of the river is very small, there is not enough water, and the "rapids and waterfalls" can only be seasonal, and the "rapids and canyons" are difficult to exist.

The coordinates of point A are (23°26 s, 20°W), and when the sun hits point A, it means that 20°W is 12 o'clock at noon, so that you can calculate the time in Beijing, 20°W is the first district in the west, and Beijing is in the eighth district in the east, with a difference of 9 hours, so it is 21 o'clock in Beijing at this time.

The date is December 22, the winter solstice, as the sun shines on the Tropic of Capricorn.

At this time, the direct point of the sun is 12 o'clock on the east longitude 0 degrees, that is, the east longitude 0 degrees is 12 noon.

Beijing in the East 8th District minus 8 hours, it is 4:...... a.m

This is December 22, and the winter solstice is 4 o'clock in Beijing.

3.From the direction of rotation, it can be seen that this is the Southern Hemisphere.

As can be seen from the figure, the Antarctic Circle is polar day.

That is, the sun shines directly on the Tropic of Capricorn, which is December 22.

120°W bisects the night hemisphere.

So at this time, 120°W is 0 or 24.

From the calculation: 0 + (120°-75°) 15° = 3.

East plus West minus) so choose C4The sun shines directly on the Tropic of Capricorn at 23°26 s

The Tropic of Cancer is 23°26 N

From the calculations:

Use h solar altitude angle = 90° - latitude) so choose c

4、a；5、a；6、d；

4.Let me think about the answer. I'm still a little uncertain.

Guangzhou is located on the coast of the South China Sea and the Pearl River, with vertical and horizontal rivers and abundant water. However, the sea water is brackish, and the river water also has many inconveniences in terms of sanitation and access. Although there are traces of leading Baiyun mountains and rivers into the city from the beginning of the Nanyue period, and the introduction of living water in the north of the city in the Song Dynasty has become a major project of municipal construction at that time, but after all, the flow is limited and the coverage is limited.

Therefore, the people in the city mainly relied on well water for drinking water.

From historical documents and archaeological data, it can be found that there are many ancient wells in Guangzhou. How much? In the area of about square kilometers excavated at the site of the National Palace Administration of Nanyue, there are more than 600 ancient wells of all dynasties.

Many ancient wells are also related to celebrities, such as Bao Gu, Dharma, Zhao Tuo, Yang Fu and so on. Therefore, the well is not only a public facility, but also a memorial with a story.

South Vietnam's "Viet King Well": the simplest and most effective water filtration system.

On the north side of the spacious courtyard of the Nanyue Palace Museum in Guangzhou, there is a red building "Drinking Water and Thinking of the Source" ancient well exhibition room. Among them, in the way of original site display, a number of exquisitely designed and well-built ancient wells in the Nanyue Kingdom and the Southern Han Kingdom are displayed. One of the deepest ancient wells in Nanyue is as deep as a meter.

This is also the deepest Han Dynasty brick well found in Chinese archaeology at present. Looking down from the wellhead, the water is sparkling, and the wall of the well made of blue bricks clearly shows that there is continuous water seeping out. A water pipe connected to the pumping machine runs into the water along the wall of the well, and the museum staff said that the water in this well is still abundant, and because the excavated wellhead is 4 meters lower than the current ground level, if the pumping is not maintained, the well water will overflow.

The water quality in the 14-meter-deep Nanyue Ancient Well is said to be good, but it is still not as good as the other well in the showroom. The simple and ingenious design of the well, coupled with the meticulous construction, has formed a sophisticated water filtration system: a pit 3 meters wide and 9 meters deep is dug first, and then a meter-wide well ring is built with arc fan bricks, and the outside of the well ring is tamped with pure hill soil to prevent the underground sewage outside the well from seeping into the well.

The bottom of the well is paved with five large stone slabs, a square stone slab in the middle is chiseled with a round hole, and the rest of the four arc-shaped stone slabs around the well are also chiseled with a semicircular small hole, and the well water is slowly infiltrated from the aquifer at the bottom of the well by five small holes. A layer of fine sand about 8 centimeters thick is also laid under the stone slab to filter the well water. According to the experts involved in the excavation, the water in the well is drinkable on site.

Judging from the ingenious design, it should have been the exclusive drinking water well for the royal family at that time.