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13	13	= Primary =
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15		-The primary fraction is the fraction which is more than 50% of the same material. If this primary faction is anthropogenic the layer gets the name of the anthropogenic substance. The quality of the sample of the primary fraction needs to be QM5 and with organic soil QM4.
	15	+The primary fraction is the fraction which is more than 50% of the same material. If this primary faction is anthropogenic the layer gets the name of the anthropogenic substance. For the name of the primary fraction one can take a look at the category [[soil specification>>url:https://terrapedia.terraindex.com/index.php?title=Soil_specification&action=edit&redlink=1]]. The quality of the sample of the primary fraction needs to be QM5 and with organic soil QM4.
16	16
17	17	== M50 ==
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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:Characteristics .Soil boundaries.WebHome]] ==
	25	+== [[Gradation>>url:https://terrapedia.terraindex.com/index.php?title=Gradation&action=edit&redlink=1]] ==
26	26
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.
	27	+When the material has abrupt transition into the primary or tertiary fraction the [[gradation>>url:https://terrapedia.terraindex.com/index.php?title=Gradation&action=edit&redlink=1]] is called weak. With a strong [[gradation>>url:https://terrapedia.terraindex.com/index.php?title=Gradation&action=edit&redlink=1]] the border between materials is less clear and the clast size changes gradually.
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29	29	== Grain shape ==
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34	34
35	35	= Tertiary =
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37		-This category is used for the indication of a strange or [[special component>>doc:Soil.Special components.WebHome]] present in the layer. In this category many residual materials are present, for example calcium and wood. The fraction present can range from 5 to 50%. At 5% > 25% of the same material one can speak of a weak presence of the material. At 25%>50% of the same material one can speak of a strong presence of the material. Organic components are not accounted in the tertiary category. For other materials present the samples need to be of at least class QM4. Further below some components are explained.
	37	+This category is used for the indication of a strange or [[special component>>url:https://terrapedia.terraindex.com/index.php/Special_component]] present in the layer. In this category many residual materials are present, for example calcium and wood. The fraction present can range from 5 to 50%. At 5% > 25% of the same material one can speak of a weak presence of the material. At 25%>50% of the same material one can speak of a strong presence of the material. Organic components are not accounted in the tertiary category. For other materials present the samples need to be of at least class QM4. Further below some components are explained.
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39	39	== AC 16 base/ AC 16-22 base ==
40	40
41	41	Reinforcement layers for asphalt.
42	42
43		-== Cat clay ==
	43	+== Acid clay ==
44	44
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).
46		-
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]
48		-
49	49	== Ammunitions ==
50	50
51	51	Remnant of fired gun and can cause lead poisoning of the soil.
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56	56
57	57	== Asbestos ==
58	58
59		-Asbestos is a term used to refer to six naturally occurring silicate minerals. All are composed of long and thin fibrous crystals, each fiber being composed of many microscopic 'fibrils' that can be released into the atmosphere by abrasion and other processes. Asbestos is used to strengthen ceramic creations and in walls or roofs of houses. When one suspect the presence of asbestos in a decayed wall or roof one needs to select the 'Asbestos suspect material'-field. More on asbestos-sampling and other specification can be found on the following [[page>>doc:Characteristics .Samples .Asbestos.WebHome]].
	55	+Asbestos is a term used to refer to six naturally occurring silicate minerals. All are composed of long and thin fibrous crystals, each fiber being composed of many microscopic 'fibrils' that can be released into the atmosphere by abrasion and other processes. Asbestos is used to strengthen ceramic creations and in walls or roofs of houses. When one suspect the presence of asbestos in a decayed wall or roof one needs to select the 'Asbestos suspect material'-field. More on asbestos-sampling and other specification can be found on the following [[page>>url:https://terrapedia.terraindex.com/index.php/Asbestos]].
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61	61	== Asphalt or bitumen ==
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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>>url:https://terrapedia.terraindex.com/index.php/Clay]] ==
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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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174	174	Any rock-forming mineral that has a specific gravity greater than 2.8 and that is generally dark in color.
175	175
176		-== [[Detritus>>doc:Organic depositions.Detritus.WebHome]] ==
	172	+== [[Detritus>>url:https://terrapedia.terraindex.com/index.php/Detritus]] ==
177	177
178	178	Detritus is particles of rock derived from pre-existing rock through processes of weathering and erosion. Detritus can also be dead organic material.
179	179
180		-== [[Dolerite>>doc:Rock types.Igneous rocks.Extrusive igneous rocks.Dolerite.WebHome]] ==
	176	+== [[Dolerite>>url:https://terrapedia.terraindex.com/index.php/Dolerite]] ==
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182	182	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.
183	183
184		-== [[Dy>>doc:Organic depositions.Dy.WebHome]] ==
	180	+== [[Dy>>url:https://terrapedia.terraindex.com/index.php/Dy]] ==
185	185
186	186	Type of soil formed in nutrient low waters which mainly consist of very fine sunken organic components.
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208	208	Gravel is a loose aggregation of rock fragments. Gravel is classified by particle size range and includes size classes from granule- to boulder-sized fragments. ISO 14688 grades gravels as fine, medium, and coarse with ranges 2 mm to 6.3 mm to 20 mm to 63 mm.
209	209
210		-== [[Gypsum>>doc:Rock types.Salts.Gypsum.WebHome]] ==
	206	+== [[Gypsum>>url:https://terrapedia.terraindex.com/index.php/Gypsum]] ==
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212	212	Gypsum is the common name for CaSO,,4,,·2 H,,2,,O and is present at places where the sea water is partly or totally dried up. These dried up areas form loose layers in between the other rocks. This type of rock is soluble in water and is formed close to halite and anhydrite. Gypsum breaks into rhombus shaped pieces.
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236	236	Limestone is a sedimentary rock composed from remnants of small sea organisms. One can say a rock is limestone upon discovering a fossil. Limestone is made up from calcium carbonate and therefor a very soft rock type. It can be distinguished from other rock types with the help of HCl, because it sizzles when HCl touches its surface.
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238		-== Loam ==
	234	+== [[Loam>>url:https://terrapedia.terraindex.com/index.php/Loam]] ==
239	239
240	240	Loam is a soil type which mostly consist of sand and silt particles. A smaller amount of clay particles is present too. By weight, its mineral composition is about 40-40-20% concentration of sand-silt-clay respectively. If this proportions vary it is classified as the main type plus the name loam. For example: sandy loam, clay loam, etc.
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362	362	Unwanted or unusable material, substances, or by-products.
363	363
364		-== [[Wood>>doc:Organic depositions.Wood.WebHome]] ==
	360	+== [[Wood>>url:https://terrapedia.terraindex.com/index.php/Wood]] ==
365	365
366		-Wood is the hard fibrous material that forms the main substance of the trunk or branches of a tree or shrub, used for fuel or timber.
	362	+Wood is the hard fibrous material that forms the main substance of the trunk or branches of a tree or shrub, used for fuel or timber.
367	367
368	368	== ZOAB ==
369	369