Question: How much land in the country of the person who could describe the process of evaporation is good for farming?

<P0-S0> Wang Chong (; 27 – c. 100 AD), courtesy name Zhongren (仲任), was a Chinese meteorologist, astronomer, and philosopher active during the Han Dynasty. <P0-S1> He developed a rational, secular, naturalistic and mechanistic account of the world and of human beings and gave a materialistic explanation of the origin of the universe. <P0-S2> His main work was the "Lunheng" (論衡, "Critical Essays"). <P0-S3> This book contained many theories involving early sciences of astronomy and meteorology, and Wang Chong was even the first in Chinese history to mention the use of the square-pallet chain pump, which became common in irrigation and public works in China thereafter. <P0-S4> Wang also accurately described the process of the water cycle. <SEP> <P1-S0> Han-era astronomers adopted a geocentric model of the universe, theorizing that it was shaped like a sphere surrounding the earth in the center. <P1-S1> They assumed that the Sun, Moon, and planets were spherical and not disc-shaped. <P1-S2> They also thought that the illumination of the Moon and planets was caused by sunlight, that lunar eclipses occurred when the Earth obstructed sunlight falling onto the Moon, and that a solar eclipse occurred when the Moon obstructed sunlight from reaching the Earth. <P1-S3> Although others disagreed with his model, Wang Chong accurately described the water cycle of the evaporation of water into clouds. <SEP> <P2-S0> Although China's agricultural output is the largest in the world, only about 15% of its total land area can be cultivated. <P2-S1> China's arable land, which represents 10% of the total arable land in the world, supports over 20% of the world's population. <P2-S2> Of this approximately 1.4 million square kilometers of arable land, only about 1.2% (116,580 square kilometers) permanently supports crops and 525,800 square kilometers are irrigated. <P2-S3> The land is divided into approximately 200 million households, with an average land allocation of just 0.65 hectares (1.6 acres). <SEP> <P3-S0> with the introduction of the blast furnace to europe in the middle ages, pig iron was able to be produced in much higher volumes than wrought iron. <P3-S1> because pig iron could be melted, people began to develop processes of reducing the carbon in the liquid pig iron to create steel. <P3-S2> puddling was introduced during the 1700s, where molten pig iron was stirred while exposed to the air, to remove the carbon by oxidation. <P3-S3> in 1858, sir henry bessemer developed a process of steel-making by blowing hot air through liquid pig iron to reduce the carbon content. <P3-S4> the bessemer process was able to produce the first large scale manufacture of steel. <P3-S5> once the bessemer process began to gain widespread use, other alloys of steel began to follow. <P3-S6> mangalloy, an alloy of steel and manganese exhibiting extreme hardness and toughness, was one of the first alloy steels, and was created by robert hadfield in 1882. <SEP> <P4-S0> cornwallis is a rural municipality located in the canadian province of manitoba. <P4-S1> it surrounds the east, south and west sides of brandon, manitoba. <P4-S2> most of the land comprising the municipality is farmland, but it contains a few settlements. <P4-S3> one of the larger settlements, sprucewoods, sits at the north gate of canadian forces base shilo and contains a large group of the municipal population. <P4-S4> in the past, there has been friction between the community and the farming base that make up much of cornwallis.