| 21. | These were exposed and rounded by weathering during the Permian Period.
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| 22. | Rocks high in silica produce silicic acid as a weathering product.
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| 23. | Weathering beneath the beaded siding reveals the exterior was originally unsheathed.
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| 24. | This problem has been reduced in newer formulations of weathering steel.
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| 25. | Some HMAs may not be resistant to chemical attacks and weathering.
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| 26. | A sharp distinction was drawn between rock weathering and soil formation.
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| 27. | After weathering several powerful leg kicks and $ 134, 000.
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| 28. | Botallackite forms in copper deposits exposed to weathering and salt water.
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| 29. | This makes it coarser, harder and more resistant to weathering.
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| 30. | The lower diagram shows the painted surface after weathering has occurred.
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