| 21. | They were formed by lateritization of various ferruginous surface layer.
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| 22. | They discovered a fast flowing current that flowed eastwards in the deep surface layers.
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| 23. | A protective surface layer of oxide and carbonate ( forms as the zinc corrodes.
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| 24. | It can also be applied to a cluster iteratively to identify multiple sub-surface layers.
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| 25. | However, the surface layer there was neither ordered, nor confined to a single layer.
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| 26. | Surface layers many be of asphalt or unbound gravel materials.
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| 27. | With time, this process leads to a mushy surface layer, known as grease ice.
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| 28. | The "'exosporium "'is the outer surface layer of mature spores.
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| 29. | The surface layer may be compacted gravel or topsoil seeded with grass and fertilizer.
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| 30. | The piece of germanium used had a surface layer with an excess of electrons.
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