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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>>url:https://terrapedia.terraindex.com/index.php?title=Gradation&action=edit&redlink=1]] ==
	25	+== [[Gradation>>doc:Characteristics .Soil boundaries.WebHome]] ==
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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.
	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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29	29	== Grain shape ==
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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>>url:https://terrapedia.terraindex.com/index.php/Detritus]] ==
	172	+== [[Detritus>>doc: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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176		-== [[Dolerite>>url:https://terrapedia.terraindex.com/index.php/Dolerite]] ==
	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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180		-== [[Dy>>url:https://terrapedia.terraindex.com/index.php/Dy]] ==
	180	+== [[Dy>>doc: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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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>>url:https://terrapedia.terraindex.com/index.php/Gypsum]] ==
	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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232	232	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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234		-== [[Loam>>url:https://terrapedia.terraindex.com/index.php/Loam]] ==
	234	+== Loam ==
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236	236	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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358	358	Unwanted or unusable material, substances, or by-products.
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360		-== [[Wood>>url:https://terrapedia.terraindex.com/index.php/Wood]] ==
	360	+== [[Wood>>doc:Organic depositions.Wood.WebHome]] ==
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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.
	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.
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364	364	== ZOAB ==
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