| 11. | When wind blows, blinding sandstorms strip off what topsoil remains.
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| 12. | Topsoil in the delta can be as much as in depth.
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| 13. | These are formed when rain falls on the highly acidic topsoil.
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| 14. | The forested area is rich in water but poor in topsoil.
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| 15. | The remaining dried material is intended for sale as topsoil enrichment.
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| 16. | Much of the topsoil washed away, resulting in disastrous erosion.
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| 17. | Others had been encountered during topsoil stripping or during quarrying operations.
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| 18. | These programs can supplement their funding by selling the topsoil produced.
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| 19. | Subsoil compaction is more difficult to be regenerated than topsoil compaction.
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| 20. | The heat lamps also reduced the moisture in the topsoil.
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