GEOG106 Lecture Notes - Lecture 4: Natural Resources Conservation Service, Clay Minerals, Permanent Wilting Point
3 Apr 2017
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Soils: it is remarkably diverse, average in the world is 6 in or 15 cm, u. s. national resource conservation service defines soils as: From regolith to soil: result of weathering is the weakening and breakdown of solid rock. Product is a layer of loose inorganic material called regolith. Soil forming factors: soil is an ever-evolving material, ***5 principle soil-forming factors responsible for soil development. Source of rock fragments in soil is from parent material. Example: transported by glaciers, or in stream valleys. Example: sandstone coarse-textured soil, shale fine-textured soil. Temperature and moisture are significant to soil formation. Chemical and biological processes accelerated by high temperatures and moisture: think of how quickly fruit turns out in heat compared to inside or in a fridge. Soils tend to be deepest in warm, humid regions, and shallowest in cold, dry regions. Climate likely to be the most influential factor in the long run.
