Over the 10,000 years since agriculture began to be developed, peoples everywhere have discovered the food value of wild plants and animals, and domesticated and bred them. The most important crops are cereals such as wheat, rice, barley, corn, and rye; sugarcane and sugar beets; meat animals such as sheep, cattle, goats, and pigs or swine; poultry such as chickens, ducks, and turkeys; animal products such as milk, cheese, and eggs; and nuts and oils. Fruits, vegetables, and olives are also major foods for people. Feed grains for animals include soybeans, field corn, and sorghum. Separate articles on individual plants and animals contain further information. Tillage operations that prepare the soil for planting and control weeds also expose bare soil to possible erosion by wind and water. Erosion removes fertile soil and contributes to problems of air and water pollution. Several techniques....

Number Of Pages: 2

Number Of Words: 515

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