EESB05H3 Lecture Notes - Lecture 2: Eluvium, Humus, Flocculation

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16 Dec 2012
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Chapter 1 and 2 are in american order, not canadian. Two possible ways to convert rock into soil : physical weathering and biogeochemical weathering (chemical change) this is where we get clay, which is chemically active. Sand is just a tiny rock, not chemically active. Soil is function of parent material, climate, topography, time, and biota all happening overtime. Regolith: the unconsodilated mantle of weathered rocks and soil on earths surface. Weathered: starts to become more complex, starts breaking up into different horizons. Unweathered: can happen by chemical and physical processes. Topography is key element in examining soil. We don"t use e in the canadian. Soil isnt being added on top of parent material, it"s working down into unweathered material. We start seeing differentiation of soil horizons in southern ontario ( last glaciation) 10-12,000 years ago. Nonsoil, (regosol, brunisol, luvisol ) 3 of the 10 soil oders in canada. The older the soil, the deeper the horizons.

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