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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]] ==
	113	+== [[Clay>>doc:Environmental Surveys.Rock types.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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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.
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210		-== [[Gypsum>>doc:Rock types.Salts.Gypsum.WebHome]] ==
	210	+== [[Gypsum>>doc:Environmental Surveys.Rock types.Salts.Gypsum.WebHome]] ==
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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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