I don t understand the geographical knowledge points, I hope you will explain

Here's the answer: First, the International Date Line, or the date line, is the beginning of a new day on Earth and the end of an old day. It is roughly divided along the 180th degree meridian, but in the northern hemisphere the Chukotka Peninsula in Asia protrudes to the east, down to the Aleutian Islands to the west, and then to the east in the Pacific Ocean.

So there is a difference in the question:

1) When the day boundary is exactly 180° longitude, the dates on the east and west sides are different, the east is the old day, and the west is the new day, but the time is the same. Assuming that the current 179°E zone time is 12:00 on June 8, then the 179°W zone time is 12:00 on June 7;

2) When the 180° longitude on the Chukotka Peninsula mentioned above is not the date line, the zone time and date are not the same.

3) Such as (1).

4) The Bering Sea and Samoa (where the date line protrudes from the Pacific Ocean) have a date line, but instead of 180°, it is about 170°W, so it is 13:00 on June 7.

ok！understand？

The International Date Line, or date line, is roughly along the 180th degree longitude. The time zone is the 12 east and west regions (15 degrees of longitude), and the east and west 12 regions are bounded by the date line, which is divided into the east 12 regions and the west 12 regions (each containing a longitude). Its Middle Twelve Zones are located on the west side of the date line and are the beginning of a new day on Earth.

The West 12th Ward is located on the east side of the date line and is the end of the old day.

If you cross the date line to the east, the date will be reduced by one day;

Crossing the date line to the west, the date is added by one day.

1. C (A and B are 90 degrees apart, that is, 6 hours, it should be the sunrise in A and the sunset in B, and the two places are on the same latitude coil, so the time of sunrise and sunset is the same, so C is correct).

2. D (It can be known that 75°N is 6 hours long, and the sunrise in place A and sunset in place B, (180°-90°E) 2=45°, 180°-45°=90°+45°=135°e That is to say, the place of 135°E is the difference of 15° in the East Eighth District (120°E) where Beijing is located, that is, one hour.

3. D (at this time, the sun shines directly on the southern hemisphere, so the shadow of the sun at noon in the dark sands of Zengmu faces north) 4. D (because the sun rises in place A and the sun has already set in place B, so the day length of 75°n is getting shorter, so the sun is in the southern hemisphere and moves south).

1c2d3d4d Answer from the library Please be sure to think.

Hello! There is no diagram that can't be answered.

Uh, dare to ask this benevolent brother, where is the picture mentioned in the title? If you let me see the picture, I can help you!

There's no diagram that can't be answered.

This is a place that I haven't known about Sakna.

Do you mean that? The answer is C, D, D, D

In the past 30 years, the sea level along China's coast has risen by 9 centimeters overall; By 2050, China's coastal sea level will rise by 13 to 22 centimeters ...... compared to 2000A few days ago, the State Oceanic Administration released the recent major discoveries made in the marine field.

The highest mountain is Mount Everest.

The longest mountain range in the Andes.

The largest plain is the Amazon plain.

The largest plateau in the Brazilian Altiplano.

The largest basin is the Congo Basin.

The highest plateau is the Qinghai-Tibet Plateau.

The largest island is Greenland.

The largest peninsula in the Arabian Peninsula.

The longest river is the Nile.

The river with the widest basin area is the Amazon River.

The largest freshwater lake in terms of area is Lake Superior.

The largest inland lake in the Caspian Sea.

The largest group of freshwater lakes in North America, the Great Lakes.

The largest country in terms of area is Russia.

The most populous country is China.

The largest area of tropical rainforest is the Amazon rainforest.

The continent with the highest average altitude is the Antarctic continent

The largest continent in terms of area is Asia.

The deepest trench in the Mariana Trench.

The lowest place on land is the Dead Sea.

The largest ocean in the Pacific Ocean.

11. The isobaric side is bent upwards for high pressure, and downward bending is for low pressure.

The low pressure near the surface in the middle is formed by the rise of the heated airflow, and the high pressure near the surface on both sides is formed by the sinking of the cold airflow.

12.The subsidence of the land airflow in the figure indicates that the temperature is lower than that of the ocean, so it is judged to be night.

Let's be more detailed, if you have any questions, I'll answer them for you.

But this question does not appear after 200 to 1000. It's just that the adjacent contours are not equally distant. （There is no rule that contours must be equidistantOtherwise, for example, if you draw the precipitation line in Asia and take 100 as a unit, then you want to draw 110 contour lines in India!?

Impossible! ）

Suppose the question is givenTopographyFigure: Let's simplify the diagram, the contour line difference on the red mountain side is 300, and the difference on the green side is not uniform, indicating that this problem does not rely on the contour line value, the difference between 5000 and 200 is too large, and the contour line above C is very dense, indicating that B green has formed an extremely steep mountain here, and A is located in the transition zone between the red mountain and the green mountain.

If you still don't understand, you can imagine splitting the line of Green Mountain 2000-A-Red Mountain, and get this cross-sectional map, which shows that A is located in the valley between the two mountains, with a low altitude, sparse contour lines, and flat terrain. (and with a high degree of probability, rivers will form).

Your question should not be about precipitation lines. Looking at the map is complicated, the terrain should be the most likely.

c Because carbon dioxide is the main greenhouse gas, it leads to the greenhouse effect on the earth and global warming.

The Big Dipper belongs to the constellation Ursa Major, and the North Star belongs to the constellation Ursa Minor.

b The Earth's rotation is one day, so it is a day and night cycle.

c There are actually two reasons for the warming of the earth, one is the greenhouse effect, and the other is that the earth is in an interglacial period, that is, the temperature rise stage, the greenhouse effect is mainly caused by carbon dioxide, and other gases are also there, but not obvious.

b The earth has day and night in a single moment, which is divided into day hemisphere and night hemisphere, and the earth rotates around the day and night completely, and it is impossible to feel the length of day and night in a day