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Summarize what factors affect the distribution of the world population.

The population distribution changes regularly with latitude, altitude and distance from the sea. The population distribution is in the horizontal direction, mainly concentrated in the northern hemisphere, where 9% of the population lives, while only 1% in the southern hemisphere. In the northern hemisphere, the population is mostly concentrated in temperate and subtropical areas between 2 and 6 north latitude. The population distribution is also concentrated in coastal areas. The population distribution is in the vertical direction. The population at high altitude is relatively sparse. < P > Usually, the mid-latitude, low terrain and coastal location have obvious attraction to the population. At present, 79.4% of the world population is concentrated in the area of 2 ~ 6 north latitude. The population below 2 meters above sea level accounts for 56.2% of the world's population, and the population at 2-1 meters above sea level accounts for 35.6% of the world's population; Although the area within 2 kilometers from the coast of the world accounts for less than 3% of the global land area, it accounts for more than half of the world's total population. The population distribution often lags behind the development of productive forces and the transfer of economic centers. The reason is that the change of population distribution depends on the time accumulation effect of natural growth rate and net migration rate, and the speed is relatively slow. Only in newly developed areas with a small population base can the migration factor produce immediate and remarkable results. Study on the distribution characteristics and formation conditions of population (phenomenon) in the world, countries and regions