In order to expand arable land and increase grain yield, the development and utilization of saline alkali land in the Yellow River Delta has attracted much attention

In order to expand arable land and increase grain yield, the development and utilization of saline alkali land in the Yellow River Delta has attracted much attention

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China's land area is 9.6 million square kilometers, about 1600 square kilometers of land desertification every year. According to this calculation, how many square kilometers are there in 500 years
If we don't control it, our country will become a desert in a few years?

1600 × 500 = 800000 square kilometers
9600000 △ 1600 = 6000 (year)
A: in 500 years, there will be 800000 square kilometers of land desertification. If we do not control it, our country will become a desert after 6000 years

What is the proportion between population and per capita cultivated land area when the cultivated land area is fixed?

Inverse ratio

According to population, area, population density, cultivated land area and per capita cultivated land area, the top ten countries in the world are listed
The top ten countries in the world should be listed according to the above ranking

Population: China, India, USA, Russia, Brazil, Japan, Nigeria, Pakistan, Bangladesh area: Russia, Canada, China, USA, Brazil, Australia, India, Argentina, Kazakhstan, Sudan cultivated area: USA, India, Russia, China, Canada, Brazil, Kazakhstan, Ukraine, Mexico