The Natural Features and Human Geographical Features of Diqing Prefecture

North American topography

North America is an American country dominated by English. Located in the north of America, it faces the Arctic Ocean in the north, the Pacific Ocean in the west and the Atlantic Ocean in the east. It covers Canada, the United States and Greenland (Denmark).

Plains below 200 meters above sea level account for about 20%, plains and hills above 200 meters above sea level account for about 22%, plateaus and mountains above 500 meters above sea level account for about 58%, and the average elevation of the whole continent is 700 meters. The basic feature of continental topography is that the north-south mountains are distributed on the east and west sides parallel to the coast, and the great plains are distributed in the middle. The terrain is clearly divided into three areas.

Mountains and plateaus in the east: Labrador Plateau in the north of the St. Lawrence River and Appalachian Mountains in the south. The terrain is high in the south and low in the north, and the altitude is generally 300-500 meters. There is a long and narrow coastal plain along the Atlantic Ocean on the east side of the Appalachian Mountains, and the west side gradually descends to meet the central plain.

Central Plain: Located between Labrador Plateau, Appalachian Mountains and Rocky Mountains, it starts from Hudson Bay in the north and reaches the Gulf of Mexico in the south, and runs through the central part of the mainland. There are many lakes and rapids in the northern half of the plain, and the Mississippi River plain in the southern half.

Impact on climate

1. The coastal mountains press the Pacific coast, and the windward slope is rich in topographic precipitation. However, the coastal mountains prevented the warm and humid westerly winds from advancing eastward in the Pacific Ocean, and restricted the temperate maritime climate and the Mediterranean climate to extend eastward to the west of the mountains, so that the above two climates were distributed in the coastal areas in a north-south direction. Due to the terrain barrier, it is difficult for marine water vapor to enter the mountain plateau basin, so the climate is dry and presents a desert scene.

2. The northwest slope of the eastern highland meets the northwest wind in winter, which often causes heavy snow; The southeast slope lifts the Atlantic water vapor, resulting in topographic precipitation. However, due to the low altitude and poor continuity in the east, the dry and cold northwest wind in winter can affect the east coast, and the warm and humid airflow from the Atlantic Ocean can also cross the highlands and enter the inland in summer.

3. The seasonal variation of temperature and precipitation in the central plain is the largest, which is continental. This is because the central plain

The terrain is low, there are no east-west mountains, and the north and south are open, making the north-south airflow unimpeded. In winter, the polar cold air mass can go south and suddenly cool down. In summer, the tropical heating mass from the Gulf of Mexico can go north freely, and the weather is much sultry.

It is raining. Under the control of cold and warm air masses, a temperate continental climate has formed in the Central Plains, with strong seasonal changes in temperature and precipitation and strong continental nature. Residents are

There are many immigrants, mainly British and French. Native Indians and Inuit are yellow people.