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APES- Soils Flashcards

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9791115089Physical weatheringBreaking down rocks through physical processes like freezing and thawing0
9791115090Chemical weatheringBreaking down of rocks by chemicals, like enzymatic activity, acid precipitation, and oxidation1
9791115091ErosionProcesses by which rock, sand, and soil are broken down and carried away2
9791118740HumusRich, dark organic material formed by decay of vegetable matter, essential to soil's fertility3
9791118741LeachingRemoval of dissolved materials from soil by water moving (percolating/infiltrating) downwards4
9791118742O horizonSoil layer that has organic matter in various stages of decomposition5
9791121916A horizonSoil layer characterized by mixing of organic material and mineral material; also known as topsoil6
9791121917B horizonSoil layer that receives the minerals and organic materials that are leached out of the A horizon.7
9791121918C horizonLeast weathered soil horizon that is similar to the parent material8
9791125811Soil tilthPhysical condition of soil in relation to plant growth; soil texture9
9791125812PermeabilityAbility of rock or soil to allow water to flow through it10
9791128705SandCoarsest soil sediment size, with particles 0.05,2.0 mm in diameter.11
9791128704PorosityThe percentage of the total volume of a rock or sediment that consists of open spaces.12
9791128706SiltSediment particles ranging from 0.004 to 0.06 mm that may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension with water (also known as a suspended load) such as a river.13
9791128707ClayThe finest soil sediment, made up of particles that are less than 0.002 mm in diameter.14
9791132390LoamAgricultural soil with optimal portions of sand, silt, clay (40%, 40%, 20%)15
9791132391AlfisolsModerately weathered deciduous forest soils; moist, highly mineral-rich soils16
9791134889AridisolsDry soils found in most desert areas; salinization common17
9791134890MollisolsFertile, dark soils of temperate grasslands18
9791134891OxisolsIntensely weathered soils of tropical and subtropical environments19
9791139437SpodosolsAcidic soils with a subsurface accumulation of metal-humus complexes soils of coniferous (needle-leaf evergreen, pine) forests (Taiga/Boreal)20
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