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1		-XWiki.terraindex
	1	+XWiki.RoelofZwaan

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41	41	Reinforcement layers for asphalt.
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43		-== Cat clay ==
	43	+== Acid clay ==
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45		-Katteklei, also cat clay is the common name for mostly clay (but sometimes venomous) deposits in which, in addition to sulphuric acid, large amounts of iron, aluminum and heavy metals also occur. As a result, the soil is poorly suited for agriculture. These soils are especially recognizable by the yellow jarosite spots, in addition, iron stains are common. The acidity of the soil is high (pH 9).
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47		-Katteklei forms in soils that naturally contain many iron sulphides, especially pyrite. These usually arise in coastal areas, especially in quiet environments such as lagoons or quiet parts of estuaries and often on the edge of peatlands that emit a lot of iron-containing water. When these soils are exposed to air, for example during drainage, sulfuric acid forms. This used to happen frequently in the Western Netherlands when the drying plants were pumped out, leaving some farmers stuck with very bad plots of land. [3]
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49	49	== Ammunitions ==
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51	51	Remnant of fired gun and can cause lead poisoning of the soil.
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111	111	A porous black solid, consisting of an amorphous form of carbon, obtained as a residue when wood, bone, or other organic matter is heated in the absence of air.
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113		-== [[Clay>>doc:Rock types.Sedimenten.Clay.WebHome]] ==
	109	+== [[Clay>>doc:Gesteentes.Sedimenten.Clay.WebHome]] ==
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115	115	A stiff, sticky fine-grained earth that can be moulded when wet, and is dried and baked to make bricks, pottery, and ceramics.
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