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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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107	107	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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109		-== [[Clay>>doc:Rock types.Sedimenten.Clay.WebHome]] ==
	109	+== [[Clay>>doc:Gesteentes.Sedimenten.Clay.WebHome]] ==
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111	111	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	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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176		-== [[Dolerite>>doc:Rock types.Igneous rocks.Extrusive igneous rocks.Dolerite.WebHome]] ==
	176	+== [[Dolerite>>doc:Gesteentes.Igneous rocks.Extrusive igneous rocks.Dolerite.WebHome]] ==
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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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204	204	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.
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206		-== [[Gypsum>>doc:Rock types.Salts.Gypsum.WebHome]] ==
	206	+== [[Gypsum>>doc:Gesteentes.Salts.Gypsum.WebHome]] ==
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208	208	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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