soil ENVO ENVO:00001998 LTER:535 SPIRE:Soil SWEETRealm:Soil Soil is an environmental material which is primarily composed of minerals, varying proportions of sand, silt, and clay, organic material such as humus, gases, liquids, and a broad range of resident micro- and macroorganisms. Wikipedia:Soil The various 'has part' and 'has quality' relations may not hold true for all soils; however, I have yet to find counter examples. Require input from a pedologist or similar. [pbuttigieg] regolith environmental material