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1		-XWiki.terraindex
	1	+XWiki.RoelofZwaan

Content

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23	23	The secondary fraction lies between 5 and 50 % of the same material. At 5% > 20% of the same material one can speak of a weak presence of the material. At 20%>50% of the same material one can speak of a strong presence of the material. There is a possibility to add a second secondary component, but that is also the maximum of secondary components that can be present.
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25		-== [[Gradation>>doc:Eigenschappen.Soil boundaries.WebHome]] ==
	25	+== [[Gradation>>doc:Characteristics .Soil boundaries.WebHome]] ==
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27	27	When the material has abrupt transition into the primary or tertiary fraction the gradation is called weak. With a strong gradation the border between materials is less clear and the clast size changes gradually.
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41	41	Reinforcement layers for asphalt.
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43		-== Acid clay ==
	43	+== Cat 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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45	45	== Ammunitions ==
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47	47	Remnant of fired gun and can cause lead poisoning of the soil.
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170	170	Any rock-forming mineral that has a specific gravity greater than 2.8 and that is generally dark in color.
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172		-== [[Detritus>>doc:Organic depositions.Detritus.WebHome]] ==
	176	+== [[Detritus>>doc:Environmental Surveys.Organic depositions.Detritus.WebHome]] ==
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174	174	Detritus is particles of rock derived from pre-existing rock through processes of weathering and erosion. Detritus can also be dead organic material.
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178	178	Dolerite is an igneous rock with a silica amount of 48 till 52%. The minerals present in dolerite are: olivine, plagioclase, biotite, amphiboles and pyroxenes.
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180		-== [[Dy>>doc:Organic depositions.Dy.WebHome]] ==
	184	+== [[Dy>>doc:Environmental Surveys.Organic depositions.Dy.WebHome]] ==
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182	182	Type of soil formed in nutrient low waters which mainly consist of very fine sunken organic components.
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