ACCTG 1 Lecture Notes - Lecture 13: Flocculation, Ion, Regolith
Document Summary
Soil = the stuff in which plants grow; the biologically modified weathered mantle. Importance of soil: medium for plant growth, system for water supply and purification, system for water storage and flow attenuation, engineering medium, store for nutrients and carbon, recycling system for nutrients, habitat for soil organisms. The product of weathering of the parenting material. Chemical and physical weathering processes produce regolith. Regolith mixes with organic matter to produce soil: composition. Proportionally exclusive with soil water, soil air occupies the void spaces between textural separates, and between aggregates. Soil air differs to atmospheric air in several respects: composition varies greatly from place to place. It has a higher moisture content, generally approaching 100% The co2 content is higher, and the o2 content lower. The major soil classes are defined by the percentages of sand, silt and clay. A lot of soil processes take place on the surface of soil particles, both mineral particles and particles of organic material.
