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