What does "silt" mean?

Name: Mud Pinyin: yū ní Explanation: (1) [Mud; Mud]: The sediment at the bottom of a river or lake pond comes out of the mud, but it is not polluted. -Song Zhou Dunyi's On Ailian (2) [Qin; Pulp]: See this paragraph edited by "Soft Mud". In the Southern Dynasties, Liang Wudi wrote "The Book of Pure Industry": "Mud doesn't pollute his body, and heavy fainting doesn't hide his truth." Tang Fanggan's poem Dongshan Waterfall: "If Bak Yan can really decide, it should be mixed with Qian Shan." Song and Zhou Dunyi's "Love Lotus": "Love lotus only, never touch the mud, never be evil." Wei Chuantong's "Long March Poems Crossing the Axi Grassland": "The grass is trodden and the mud is soft." Edit Geology The mud in this section refers to fine-grained soil with organic matter deposited in still water and slow flowing water environment. Its natural water content is greater than the liquid limit and its natural porosity ratio is greater than 1.5. When the natural porosity ratio is less than 1.5 and greater than 1.0, it is called muddy soil. Sludge is also called sludge. Mud (viscous suspension formed by solid particles dispersed in liquid) is a solid-liquid mixture containing a small amount of liquid, such as soft mud, mud or mud.