soil review.doc

--How do different weathering features form (Why spheroidal weathering patterns?). -Soils: What is a soil. Know how soil forming factors (CLORPT) influence soil development. Soil is a weathering veneer covering the terrestrial surfaces. Soils are composed of weathered mineral and decomposed organic matter. Soil profile form in residual bedrock or unconsolidated sediment. soil= important to sustain life form on terrestrial part of continents form at surface of earth. Form at different type of geological material Parent material= geological material in which soils form. Soil forming process: 1) Accumulation (illuviations) 2) Transformation 3) Removal (eluviations) 4) Translocation CLORPT= influence soil development (Hans Jenny 1941 UC Berkeley) C= climate O= Organisms R= Relief P= parent minerals T= time -vegetation play an important role in soil nutrient replacement and pH= major role in soil chemistry. Ex) sometimes grass does not grow underneath tree/ sometimes does 5-7pH common for humid region soils 7-9pH for arid region soils 3-11ph range for most inorganic soils 3-5(acidic) can kill trees, fish, etc= problematic -Slope angle/steeper slope= less soil development 1) slope angle 2) direction slope faces -bedding structure influence rate of soil development. Soil get deeper with eroding age, soil gets redder more oxidation with age, particles get finer with age -soils age= 1) thicker 2) redder 3) clay content increase