| 21. | The falls formed when water erosion by streams created gorges through layers of basalt and resistant trachyte.
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| 22. | It can be used on any waterway or water containment where there is potential for water erosion.
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| 23. | Water erosion of the softer sandstone left behind the columnar structure of harder rock that exists today.
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| 24. | All areas of the Ancestral Puebloan homeland suffered from periods of drought, and wind and water erosion.
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| 25. | The incident was believed to have been caused by water erosion of the limestone beneath Ryan's grave.
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| 26. | Schoch states that wind erosion forms distinctive horizontal bands, whereas the water erosion features are clearly vertical.
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| 27. | Ploughing leaves very little crop residue on the surface, which otherwise could reduce both wind and water erosion.
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| 28. | Rye is very effective in preventing wind and water erosion and it is commonly grown for this function.
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| 29. | The cave, which was created by natural water erosion, was fortified with a wall, barred gateway and arrowslits.
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| 30. | Differential water erosion, sometimes as part of a freeze-thaw cycle, opens the cracks wider and wider over time.
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