41. These problems are greatest where the topsoil is less than ten centimeters. 42. It lies on carboniferous limestone with rock showing through the thin topsoils . 43. This was a sheet of chalk covered by brickearth covered with topsoil . 44. Soil organic carbon tends to be concentrated in the topsoil . 45. Much of the rich topsoil crop was washed downstream into large reservoirs. 46. The French commander also removed much of the topsoil around San Cristobal. 47. Also, the intensive use of heavy machinery damaged topsoil . 48. The site contains contaminants including PCBs that penetrate the topsoil to bedrock. 49. All it took was a heavy wind for the topsoil to take flight. 50. It got so that you could make more delivering topsoil than delivering babies.
