| 11. | The iron and humus particles released by the topsoil precipitate onto this impervious hardpan.
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| 12. | A thick layer of humus with a phosphate hardpan lies under the Pisonia forests.
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| 13. | Nine houses were flooded with mud and water when flooding poured through the hardpan desert.
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| 14. | Strong trade winds blew away most of the topsoil, leaving behind red hardpan dirt.
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| 15. | The results are primarily determined by how extensive and / or intractable the hardpan is.
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| 16. | The ditches around the circles penetrated the hardpan, helping to drain the prairie soil.
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| 17. | This block consists of the broad alluvial plains of Turee Creek flanked by hardpan plains.
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| 18. | Q . My driveway is on hardpan, and is too long to pave with asphalt.
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| 19. | There is little doubt that coarsening beaches by reducing them to hardpan and gravel affects salmon.
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| 20. | It is ingeniously and pridefully designed, with a frayed Persian carpet on the hardpan floor.
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