CSS 210 Lecture 3: Horizon Evolution and Nomenclature (3).txt
Document Summary
Layers within the siol are called a horizon and a verticle section of soil consisting of horizons is called a soil profile. The uncolisadted material in which soil profiles develop is called the parents material and soil profiles develop in parent material of both mineral and organic origin. Mineral parent material comes from the weathering of consolidated bedrock and organic parent material comes from the accumlation of dead plant debris in very wet areas. 30 cm of sandstone ma whether in 300 yrs. In the weathering of limestone, soil develops from the insoluble impurities that remain after the ca and mag carbonates have leached from weathering environment. Limestone is wethered at 30 cm in 10,000 yrs. It contains 10% impurities. (10% x: 3cm of soil formed, after 50,000 yrs, there"s 15% Parent material for organic soils commonly comes from the filling in of a lake with organic matter.