Geography problems in the third year of junior high school Urgent geography problems in the second y

1.Reason: Untreated domestic sewage and industrial wastewater are discharged into rivers and offshore waters, and offshore oil exploitation activities pollute the ocean due to oil leakage and other reasons, which makes the marine pollution load exceed its own self-purification capacity, and changes the offshore water and biological environment (red tide), so the offshore sea water "turns black" instead of "blue".

Therefore, it is necessary to rectify the polluting industries in the rivers and coastal areas that flow into the sea, strengthen the treatment and treatment of waste water, take scientific and effective measures to reduce the pollution of the coastal waters caused by oil exploitation activities, and actively prevent the vicious transformation of the marine ecology.

2.The Yellow River flows through the Loess Plateau, bringing a large amount of sediment from the upstream to accumulate here (hydraulic sedimentation), but the loose soil, coupled with the relatively low vegetation coverage, is easy to be washed by rain, the surface is bare leakage, and the surface of the bare leakage is weathered (wind erosion) sand increases, and the strong wind from the northwest brings a large amount of sand and dust accumulation to form the form of loess everywhere.

1: Domestic sewage is not treated and discharged from industrial wastewater.

So that the pollution exceeds the self-purification capacity of the water body, so it turns black.

It is possible to reorganize the surrounding factories and dispose of domestic sewage and industrial wastewater after treatment.

2 The soil of the Loess Plateau is loose, and it is windy there, the vegetation coverage rate is relatively low, and the soil erosion is serious under the erosion of rain.

Answer: d

Why: International Labor Day is May 1. Close to 6

On the 22nd of the month, the summer solstice is up. So at this time, although it is moving north, it has reached the northern hemisphere. Therefore, it is excluded that National Day, October 1, and the autumnal equinox day is September 23, so it is moving south, so it is excluded Children's Day, which is June 1, and the summer solstice is June 22, so the reason is the same as answer A, which is excluded.

On New Year's Day, January 1, the winter solstice, the sun shines directly on the Tropic of Capricorn, and the time is December 22At this time, it has passed, so it is moving north, but it is not until March 21 (the day of the vernal equinox), so it has not yet crossed the equator, so it is still in the southern hemisphere. In line with the topic.

Sweat, pure hand-beaten, but also analysis. There is no mouth to say fast, alas.

d'The direct point of the sun is moving north, but it is still in the southern hemisphere", which should be met from the winter solstice to the spring equinox.

d, the period from the winter solstice to the vernal equinox.

It should be d. On the winter solstice, the sun shines directly on the Tropic of Capricorn, and after the winter solstice (December 22), the direct point of the sun begins to move northward, and it hits the southern hemisphere until the vernal equinox, so it should be January 1, New Year's Day.

Selection: Labor Day is May 1, when the sun should be shining directly in the Northern Hemisphere because the vernal equinox has passed.

Item B: The autumnal equinox has passed on October 1, and the direct point of the sun is moving southward.

Item C: June 1 is the same as item A.

The difference in altitude is too great.

Clause. I.

II. Third. First, the average altitude is more than 4000 meters.

Because the earth is a sphere, after going 100 km to the south, it will go 100 km to the west, whether it is at the same latitude, 100 km from the North Pole, so if you go 100 km north, you will return to the same place.

The parallels are a full circle, the meridians are semicircles, and the equator, like all meridians, is a great circle that passes through the center of the earth. That is, the length of the 0° latitude = 0° warp + 180° warp coil.

B should be chosen, the north-south walk is along the meridian, and the length of the meridian is equal to the whole world, so it must be the east-west walk that affects the position. Heading south from the equator, the weft coil becomes shorter and the distance traveled remains the same, so the direction is more westerly.

1. Take a globe and compare it to understand.

The latitude is a great circle, and the 0° longitude is half a great circle. 3、b

First question: The path is fan-shaped, from the point back to the point.

Question 2: The weft is a great circle through the center of the earth, and the meridian is a semicircle.

Third question: b

1.Because both the north and south directions pass through the North Pole, it is equivalent to walking a spherical triangle.

The latitude line is the great circumference of the Earth, and the 0° meridian is only half (i.e., from the South Pole to the North Pole).

3.Return to the west of the departure point.

Topographic rain: due to the obstruction of the high compound mountain vein or plateau, the qi flow rises on its windward slope, and the precipitation is condensed.

Convective rain: due to heat.

The DAO airflow rises and condenses to produce precipitation, which is generally produced in areas with higher temperatures. Convective rain produced by tropical rainforest climate is the most typical; Larger cities also produce significant convective rain in the summer due to the heat island effect.

Frontal rain: A front is formed at the intersection of cold and warm air masses, and precipitation is generally produced at the front, which can be divided into warm fronts, cold fronts, and quasi-stationary fronts according to the nature and direction of movement of air masses. Most of the precipitation in the eastern monsoon region of China is frontal rain.

Huoyaoliao: In the northern part of Taiwan, because the Taiwan Mountains block the water vapor of the Pacific Ocean, abundant topographic rain is formed.

It is located in the windward slope of the precipitation area is more, tall mountains and plateaus can be formed, the more typical are: for example, the north slope of the Tianshan Mountains has more precipitation than the south slope, because the north slope is the prevailing westerly wind; The precipitation on the southern slope of the Qinling Mountains was more than that on the northern slope, and the precipitation on the eastern slope of Changbai Mountain was more than that on the western slope, all of which were due to the windward breaking of the southeast monsoon in many places. The southeastern part of the Tibetan Plateau receives more precipitation than the northwest, also because it is on the windward slope of the southwest monsoon, resulting in the emergence of the world's rain pole on the southern side of the Himalayas: Kerapenzi.

1. The earth-shaped rain appears on the windy slope of the mountain range, that is, on the side of the mountain facing the ocean. For example, the western side of the Antidus Mountains, the southern slope of the Himalayas, and the eastern slope of the Taiwan Mountains in China have a lot of terrain rain, and Huoyaoliao is a lot of terrain rain.

2. Convective rain is distributed in tropical rainforest climate zones near the equator, such as the Malay Archipelago, the Amazon Plain and other areas.

3. Peak rain is the rain produced by the encounter of cold and warm air, and there are many peak rains in the eastern part of China.

China's topographic rain area is famous for the Yunnan-Guizhou Plateau, and the convective rain is the most in Hainan Island and Nansha Islands.

Significant (tropical rainforest climate), most of the rain in China is frontal rain (except for the northwest inland Qinghai-Tibet Plateau, etc.), with the Yangtze River basin being the most famous plum rain. Huozhuo Lao is the holder of the record for the most rainfall in our country, (the world record is Kira Penzi). Located on the windward slope and rainfall in places with a lot of rainfall, there are Qinling Mountains, Yunnan-Guizhou Plateau, Hengshan, and Himalayan Mountains.

The fall of Bai in the eastern part of our country

The water is mainly brought by the summer monsoon. When zhi

The warm dao of the summer monsoon

When the airflow makes landfall and goes northward, when it meets the cold air from the north to the south, the lighter warm and humid air will be lifted above the cold air because the warm air is light and the cold air is heavy. A frontal rain was formed. At the beginning of summer every year, the winter and summer winds in the middle reaches of the Yangtze River are evenly matched, and this rain lingers here, and the rain lasts for as long as a month.

In January, just after the rainy season, as the winter monsoon recedes northward, the rain belt moves out of the middle and lower reaches of the Yangtze River, and there is a sunny and dry weather, which occurs in Futian is also called Futian.

Rainy terrain, mountainous windward slopes.

Convective rain, equatorial region.

Frontal rain, where cold and warm air masses meet.

It is located on the windward slope and has a lot of rainfall, most typical of the western side of the Cordillera Mountains in North and South America.

First of all, the first question, you must know that the set of all meridians is the South Pole and the North Pole, and the South Pole and the North Pole have countless meridians that will meet, and the complete answer to this question is the South Pole and the North Pole.

2.At present, the earth is directly shining on the Tropic of Cancer, which is just the winter solstice and summer solstice, and the direct sunlight is constantly moving back and forth on the Tropic of Cancer. If it is vertical, the sunlight will always shine directly on the equator, it will not change, and it will not change the seasons.

Different places get different heat, and the equator gets more than the South Pole and the North Pole. If the Earth's axis is upright, except for the north and south poles, the length of day and night is the same everywhere else.

3. A meridian is the length of the arc from the south pole of the earth to the north pole, going all the way to the north, and finally it can only go to the north pole, bCountless meridians at the North Pole and the South Pole.

c。The global meridians are of equal length.