GEOG 1010 Lecture Notes - Lecture 19: Soil Texture, Mineral Alteration, Silt
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Classified according to changes in physical or chemical composition over time relatively large, unaltered compounds, same as bedrock. Primary minerals relatively small, result of chemical weathering or mineral alteration. Texture is the % of sand, silt & clay in a sample. Be able to rank them from largest to smallest. Texture classes combinations of sand, silt, and clay field hand texturing lab determine % + soil texture triangle. Structure describes the shape when individual grains aggregate. Important because structure in the soil facilitates the movement of water. Humus = very fine organic matter & a source of nutrients. Reds & yellows: rich in iron-oxides & minerals. Important to have air content in the soil, because the air in the soil has co2. Types of soil water: amount of water present size of pores a. Water removed by gravity when soil is saturated b. Water that resists gravity by clinging to soil particles via capillary tension (force)
