Summary of Unit 345, Seventh Grade Geography
2. In satellite images, green represents land, blue represents ocean, and white represents cloudy and rainy areas, and places with thick clouds are generally rainy areas.
3. The level of air quality is related to the amount of pollutants in the air, which can be expressed by pollution index. Affected by natural factors and human activities.
The temperature is measured by a thermometer in the louver. Usually do it four times a day, usually at 8: 00, 14: 00, 20: 00 and 2: 00 Beijing time.
5. The highest temperature in a certain place is 3 1℃ and the lowest temperature is 24℃, so the daily temperature difference here is 7℃.
6. Annual variation of temperature: In a year, the highest temperature on land in the northern hemisphere appears in July, and the lowest temperature appears in 65438+ 10. In the ocean, the highest temperature appears in August and the lowest temperature appears in February. (The southern hemisphere is the opposite)
The difference between the monthly average maximum temperature and the monthly average minimum temperature is called the temperature annual range.
7. On the isotherm diagram, ① the isotherms are sparse, indicating that the temperature difference is small and the isotherms are dense, indicating that the temperature difference is large; ② The isotherm is closed. If the center temperature is low, it means it is a low temperature center.
8. The distribution characteristics of global annual average temperature are as follows: ① High temperature at low latitude and low temperature at high latitude. ② In the same latitude zone, the land temperature is high and the ocean temperature is low in summer; In winter, the land temperature is low and the ocean temperature is high. ③ High altitude and low temperature.
9. In mountainous areas, the temperature drops by about 0.6℃ per altitude 100 meters. For example, at an altitude of 920 meters, the temperature is 28.8℃. Peak elevation1720m, temperature 24℃.
10. The annual average temperature in Qinghai-Tibet Plateau is 65438 00℃ lower than that in the same latitude area. The reason is high altitude and low temperature.
1 1. The isotherm in the southern hemisphere is flat. The reason is that most of the southern hemisphere is ocean, which is less affected by topography and land and sea factors.
12. (1) There is much precipitation near the equator, and the annual precipitation is more than 2000 mm; ② From the equator to the poles, the annual precipitation gradually decreases; ③ Near the Tropic of Cancer, there is more precipitation on the east coast of the mainland and less precipitation on the west coast; ④ In temperate regions, there is less precipitation in Chinese mainland and more precipitation in coastal areas; ⑤ Kilapanchi, the region with the richest annual precipitation in the world, is located in the south of Asia; Because it is located on the windward slope. ⑥ "Dry Pole" Atacama Desert, which has the least annual precipitation in the world, has little precipitation on the leeward slope in western South America.
13.BCEFG describes the weather and ADHM describes the climate.
A. The four seasons in Kunming are like spring. B: But now I still remember that night, that storm. I wonder how many flowers were broken. C: The wind will get cold tomorrow. D. the polar regions are cold all year round. The sun in the east and the rain in the west. F. the wind is drizzling and sunny. It is raining. It is cool in autumn. It's warm in bloom in spring.
14. The two elements that make up the climate are temperature and precipitation.
15. The factors affecting climate are latitude, land and sea, topography, etc.
Examples: ① The equatorial region has a tropical rain forest climate, while the polar region has a cold zone climate, and its influencing factor is latitude;
② There is more precipitation on the east and west sides of Eurasia, but less precipitation in inland areas, and the influencing factors are land and ocean;
③ The latitude of Qinghai-Tibet Plateau is low, but the climate is cold, and the influencing factor is topography;
(4) Hainan Island in China is like summer all the year round, while Heilongjiang has a long winter with a lot of ice and snow, and its influencing factor is latitude;
⑤ The climate of Tarim Basin in Xinjiang is dry, and that of Beijing at the same latitude is humid, and its influencing factors are land and sea;
16. The main factor leading to global warming is (human activities).
17. Latitude is the most important factor affecting the formation of tropical rain forest climate.
18. The climate varies greatly around the world. Such as: ① the area near the equator is hot and rainy all the year round, which belongs to the climate; ② North Africa has a tropical desert climate with high temperature and little rain all year round; (3) South Asia has high temperature all year round, which is divided into dry season and rainy season and belongs to tropical monsoon climate; ④ East Asia is hot and rainy in summer and cold and dry in winter, which belongs to temperate monsoon climate; ⑤ The Mediterranean region is hot and dry in summer and mild and rainy in winter, which belongs to the Mediterranean climate; ⑥ The polar regions are cold all the year round, with little precipitation, belonging to a frigid climate; ⑦ The Qinghai-Tibet Plateau has a plateau and mountainous climate due to its high altitude.
19. There is more precipitation in eastern China and less precipitation in western China. The main influencing factors are land and ocean factors.
1. Characteristics of world population growth:1Before the 8th century, population growth was slow; /kloc-After the 0/8th century, especially since the 20th century, the world population has increased rapidly.
2. World Population Day is in July every year. In March 2006, the total population of the world has reached 6.5 billion.
The speed of population growth is determined by birth rate and death rate. If the birth rate in a certain area is 3.5% and the natural growth rate is 2%, the death rate in a given area is 1.5%.
The distribution of the world population is uneven. Population density can be expressed by population density. A certain area covers an area of 2,000 square kilometers and has a population of 400,000. The population density of this area is 200 people per square kilometer.
8. Overpopulation and rapid population growth have had a great impact on the environment, economy and society. Therefore, China regards "family planning" as its basic national policy. However, if the population of some countries stops growing or even decreases, it will also bring about problems such as aging population, labor shortage and insufficient national defense forces. Population growth is compatible with social and economic development and coordinated with environment and resources.
9. Population density can be expressed by population density. Coastal plains in southern and eastern Asia, Europe and eastern North America are densely populated areas.
6. sparsely populated areas: extremely arid desert areas, rain forest areas with excessively humid climate, cold areas with severe cold all the year round, or plateau mountainous areas with high terrain.
14 The continent with the highest natural population growth rate in the world is Africa and the lowest is Europe. The state religion of Thailand is Buddhism.
15, the most widely distributed race in Asia is the yellow race, and the other continents are North America and South America. The most widely distributed race in Europe is white. Arabs in West Asia and North Africa belong to white race, black race is mainly distributed in northwest Australia, white race is distributed in northern India, and sub-Saharan Africa is the hometown of black race.
1 1. The influence of environment on the formation of human race: blacks are mostly distributed in tropical regions, whites are mostly distributed in colder regions, and yellow people are mostly distributed in temperate regions.
12. White people are mainly distributed in North Africa, West Asia and northern India. Indians and Inuit in America belong to the yellow race, and Indians in South Asia belong to the white race.
1 1, Chinese, English, French, Russian, Spanish and Arabic are the working languages of the United Nations. Chinese is the most widely used language in the world and English is the most widely used language in the world.
At present, there are over 200 countries and regions in the world. Among them, the largest country is Russian and the most populous country is China. There are 1 0 countries with a population of more than 10, of which 6 are in Asia.
2. Territory is a space for a country to exercise sovereignty, which is sacred and inviolable. Including territory, territorial waters and airspace within the national boundaries.
According to the different levels of economic development, we divide the countries in the world into developed countries and developing countries. Developed countries are mainly distributed in Europe, North America, Oceania and Japan in Asia. Developing countries are mainly distributed in Asia, Africa and Latin America. At present, China belongs to a developing country.
At present, some developing countries even surpass some developed countries in some fields, such as Indian software industry, China's aerospace industry and nuclear industry.
The largest international organization in the world is the United Nations, with its headquarters in new york, USA. Its purpose is to promote national development and safeguard world peace. The five permanent members are China, French, Russian, British and American.
What are the meanings of "North-South dialogue" and "South-South cooperation"?
North-South dialogue: political and economic negotiations between developing and developed countries; Cooperation among developing countries.
10, the environment has a great influence on the formation of human race.
12, villages and cities are collectively called settlements. About half the people in the world live in cities.
13. Conditions for settlement formation: convenient transportation, flat terrain, abundant water, rich resources and fertile soil.