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  2. Wheal Martyn - Wikipedia

    en.wikipedia.org/wiki/Wheal_Martyn

    There are areas that were used for thickening the clay: settling pits, with a sloping floor, where the clay settled for several days until it had about 12% solids; settling tanks, where the clay reached about 30% solids in two to three months; the pan kiln, or "dry", where clay was heated from below by gases from coal-fired furnaces, and dried ...

  3. Soil color - Wikipedia

    en.wikipedia.org/wiki/Soil_color

    Highly oxidized red soil in Tirunelveli District, India. Red colors often indicate iron accumulation or oxidation in oxygen-rich, well-aerated soils. [4] Iron concentrations caused by redox reactions because of diffusion of iron in crystalline and metermorphic rock, in periodically saturated soils may also present red colors, particularly along root channels or pores.

  4. Modelling clay - Wikipedia

    en.wikipedia.org/wiki/Modelling_clay

    Paper clay is handmade or commercially available clay to which a small percentage of processed cellulose fiber is added. The fiber increases the tensile strength of the dry clay and enables dry-to-dry and wet-to-dry joins. Commercial paper clays air-dry to a firm, lightweight sculpture, with minimal shrinking during the drying process. [4]

  5. Physical properties of soil - Wikipedia

    en.wikipedia.org/wiki/Physical_properties_of_soil

    Clay cannot be resolved by optical microscopes as its particles are 0.002 mm (7.9 × 10 −5 in) or less in diameter and a thickness of only 10 angstroms (10 −10 m). [16] [17] In medium-textured soils, clay is often washed downward through the soil profile (a process called eluviation) and accumulates in the subsoil (a process called ...

  6. Soil horizon - Wikipedia

    en.wikipedia.org/wiki/Soil_horizon

    Iron oxides and clay minerals accumulate as a result of weathering. In soil, where substances move down from the topsoil, this is the layer where they accumulate. The process of accumulation of clay minerals, iron, aluminum, and organic compounds, is referred to as illuviation. The B horizon has generally a soil structure.

  7. Clay - Wikipedia

    en.wikipedia.org/wiki/Clay

    Gay Head Cliffs in Martha's Vineyard consist almost entirely of clay. A Quaternary clay deposit in Estonia, laid down about 400,000 years ago. Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4).

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