EROSION

(See also Agriculture; Conservation; Farms)

beaches: g71 8/22 22

dust storm in United States: g36 9/23 825; g35 8/14 730; g35 8/28 749

soil: g69 11/22 23; g63 1/22 26; g63 3/22 21; g63 6/8 20-23

topsoil lost annually: g85 6/22 31

trees help prevent: g80 3/8 23-24; g63 3/22 21; g56 4/8 13