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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 ( OH) 4 ). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide.
Expansive clay is a clay soil that is prone to large volume changes (swelling and shrinking) that are directly related to changes in water content. [1] Soils with a high content of expansive minerals can form deep cracks in drier seasons or years; such soils are called vertisols. Soils with smectite clay minerals, including montmorillonite and ...
The Unified Soil Classification System ( USCS) is a soil classification system used in engineering and geology to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol. Each letter is described below (with the exception of Pt ): If the ...
A garden ornament or lawn ornament is a non-plant item used for garden, landscape, and park enhancement and decoration. History [ edit ] Early examples of the use of garden ornaments in western culture were seen in Ancient Roman gardens such as those excavated at Pompeii and Herculaneum .
The use of soil tests, coupled with the corresponding provisions, can alleviate issues of nutrition and irrigation that can result from non porous Ultisol. Soil tests help indicate the pH, and red clay soil typically has a low pH. The addition of lime is used to help to increase the pH in soil and can help increase the pH in Ultisol as well.
Huishan clay figurine ( Chinese: 惠山泥人; pinyin: Huìshān ní rén) is a traditional Chinese folk art in Wuxi, Jiangsu Province, China, with a history of more than 400 years. [1] [2] The production of Wuxi Huishan clay figurines began at the end of the Ming dynasty and developed in the Qing dynasty with specialized Huishan clay ...
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