There are two main reasons for its formation
One: internal force
Refers to the internal energy of the earth
It causes the earth's crust to lift. or fall, or translate Movement. This process refers to the so-called vicissitudes of life. Due to the uplift of the earth's crust, the original ocean can become land, and the original land can also become ocean. the main reason for the formation of the Tibetan Plateau, as the Indian plate continues to move northward
2: External Force
Basically it refers to solar energy< /p>< p> Divided downward into wind force
The North China Plain is the effect of flowing water Typical impact plain
The formation of the Eastern European plains is inseparable from the action of glaciers
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Internal forces form the basic pattern of the Earth's surface
External forces shape mountainsCut and fill lowlands
The process of external forces is weathering and erosion. , transport, accumulation, consolidation and diagenesis
Most deserts and plains are formed by external forces
Compared to the North China Plain at the same latitude ,Delingha is located in the arid and semi-arid climate zone of northwest China, with less precipitation, sunnier days, higher altitude, thin air, and attenuated solar radiation by atmosphere. Less and stronger solar radiation and abundant solar energy.
Arid and semi-arid areas are rich in radiation and heat resources, but precipitation resources are insufficient, making the rate of development and utilization of climate resources very low due to lack of data. on mountainous areas with heavy precipitation, the degree ofhe drought in this area reflected by meteorological data mainly from lowland observation stations may not be completely consistent with the actual situation. Likewise, it cannot be concluded based on per capita per acre water figures. water resources that northwest China is not arid, or the degree of drought is not as severe as that of northern China. Conclusion The water resources mentioned here are based on hydrological statistical data, they include only two components: runoff and groundwater replenishment. but do not include soil water. In areas with little precipitation, most precipitation infiltrates into the ground and becomes soil water, and it is difficult to form runoff or replenish groundwater. Therefore, a large proportion of soil water is not included, and the error is . very bigd.