Grade 7 Geography Units 1 to 3 focus on summary 50

Population and race.

The rate of population growth is determined by the birth rate and death rate.

Natural growth rate = birth rate - death rate.

Population density indicates the degree of depopulation that is desolate. Population density generally refers to the average number of people living within each square kilometre.

The number of people living in an area

Population density (sq km) = area of the area (sq km).

Densely populated areas: plain areas near the sea at low and middle latitudes.

Sparsely populated areas: extremely arid'Desert areas, rainforest areas with too humid climates, high-latitude areas with severe cold all year round, or plateaus and mountainous areas with high terrain.

The main distribution areas of Caucasian people: African jujube rolling and northern, Europe, Oceania Guess, North America, the east coast of South America, and western Asia.

The main distribution areas of yellow people: eastern Asia, northern North America, and northwest South America.

The main distribution areas of black people: southern Africa, northwestern Oceania.

Beginning in the mid-16th century, European colonizers began to capture black Africans and sell them to the Americas as slaves to make up for the shortage of labor in the Americas. Stool staring.

Summary. Grade 7 Human Geography Knowledge Points Unit 3 1There are two important characteristics of the weather:

Weather reflects the atmospheric conditions of a place for a short period of time; At the same time, the weather in different places can vary greatly. 2. The highest temperature of the day occurs around 2 o'clock in the afternoon, and the lowest temperature occurs around sunrise. 3. In a year, the temperature in the northern hemisphere is the highest in July and the lowest in January on the mainland.

During the year, the temperature in the southern hemisphere is the lowest in July and the highest in January on the mainland. 4. From the equator to the poles, the temperature gradually decreases.

Grade 7 Human Geography Knowledge Points Unit 3 1Weather has two important characteristics: it reflects the atmospheric conditions in a state and a place for a short time; At the same time, the weather in different places can vary greatly.

2. The highest temperature of the day occurs around 2 o'clock in the afternoon, and the lowest temperature occurs around sunrise. 3. In a year, the temperature in the northern hemisphere is the highest in July and the lowest in January on the mainland. During the year, the temperature in the southern hemisphere is the lowest in July and the highest in January.

4. From the equator to the poles, the temperature gradually decreases.

I want the knowledge points of the third unit of human geography in the second volume of the seventh grade.

Grade 7 Human Geography Knowledge Points Unit 3 1Weather has two important characteristics: it reflects the atmospheric conditions in a state and a place for a short time; At the same time, the weather in different places can vary greatly.

2. The highest temperature of the day occurs around 2 o'clock in the afternoon, and the lowest temperature occurs around sunrise. 3. In a year, the temperature in the northern hemisphere is the highest in July and the lowest in January on the mainland. During the year, the temperature in the southern hemisphere is the lowest in July and the highest in January.

4. From the equator to the poles, the temperature gradually decreases.

Is this the knowledge point of the third unit of human geography in the second volume of the seventh grade?

Hello, according to your requirements, the third unit of human geography in the second volume of the seventh grade.

On a globe, the circle perpendicular to the Earth's axis and around the Earth is called the Latitude The characteristics of the Latitude are:

1 All the parallels are round

2 The length of the parallels at the same latitude is the same, and the length of the parallels at different latitudes is not the same The equator is the longest parallel, and the poles are narrowed down into points

3. All the parallels are parallel to each other

4. The parallels except the poles indicate the east-west direction

5 Any parallel line can form a circle independently, but only the equator can divide the earth equally 6 Any two adjacent parallels are equally spaced.

The meridian is on the globe, and the semicircle that connects the north and south poles and intersects perpendicular to the latitude is called the meridian, which has the following characteristics:

1 All warp threads are equal in length and have a semicircular shape

2. All meridians intersect at the north and south poles

3 all indicate the north-south direction

4 Two opposite meridians can form a meridian coil, and each meridian can equally divide the earth 5 The interval between any two meridians is the largest at the equator, and the relationship between the meridians and the latitude is perpendicular.