Earth Sciences 1022A/B Lecture 5: Weathering and Soils
1 Oct 2015
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Document Summary
Earth sciences 1022a lecture 5 weathering and soils. Introduction: two main types of weathering: mechanical and chemical (both happen at the same time) Soil: results from biologic activity combined with weathering (produces regolith without biologic input); added organics are called humus. 5 main factors in soil formation: parent material: Determines the rate of weathering (sediment vs solid rock) Important to determine what type of soil will eventually develop. The longer the surface is exposed to the air, the more soil formation there. Soil develops from the ground surface, developing over time downwards. It forms many layers that are referred to as horizons. With time, the soil development gets deeper and brightly colored: time: is from the surface, climate (most important): Slow in cold, dry areas: plants and animals, typography: soil long) Plants will live in soil, die, remains will stay there, and add nutrients to the. Deep slopes don"t develop soil very well (material can"t stay put for very.
