GEOG 101 Lecture Notes - Lecture 26: Humus, Montmorillonite, Aeration
Document Summary
Texture mix of grain sizes within sediment. The % composition of sand, silt and clay. The length of time weathering might occur. Can determine the texture of soil by the classifications. Arrangement of individual sand, silt and clay particles into aggregates called. Particles in peds held together by humus. Can be a result of human activity or natural phenomenon. Soil charts can be used to compare colors and determine soil name. Use a cross section of the soil to compare colors. The more acidic, the lower the ph. Ph a measure of hydrogen ion concentration. The amount of hydrogen ions in the soil will. H2o dissociation of hydrogen and hydroxide determine acidity. Ph for arid-region soils higher than for human-region soils. Because there is greater dissociation of water (which there is more of in human areas) The capacity of soils to adsorb (hold onto) exchangeable cations.
