STUDY GUIDE FOR TEST 2

Processes of soil genesis can be considered as state factors (the clorpt model) or as processes (inputs, outputs, translocations, transformations).  What are the state factors?  Provide example inputs, outputs, translocations, and transformations).  How is water involved in these processes?

What are the major subdivisions of silicate mineral structure?  Which are more likely to be easily weathered in soil environments?  Why?  What are the breakdown products of silicate weathering?

Several weathering processes were described.  Be prepared to discuss them in terms of chemical changes, their importance given specific types of soil solids, under what conditions do they occur.  Incongruent/ congruent?   

Why are clays so important in soil chemistry?  What is a 2:1 clay and a 1:1 clay?  How are they different?  Under what soil conditions would each kind form?  Be prepared to sketch a clay mineral structure.

Why are organic colloids so important in soil chemistry?

What is a hydroxyl, a sequioxide, a humate, a colloid, fulvic acid, allophane, imogolite, a cation, an anion, a solute, a covalent bond, a hydrogen bond, a ligand, a complex, a polyvalent cation?  How are each formed and/or moved in soils?  Bsat?  CEC?

Define flocculation, gleization, laterization, podzolization, lessivage, melanization, rubification, calcification?  What morphological clues indicate these processes have or are occurring?  Which of the soil forming factors are considered dominantly important in each?

What are the dominant weathering processes in the pedogenic regimes described in lecture?

What does the presence of soil mottles indicate?

Describe the impact of catenary relationships along a slope/along a drainage sequence.  How will soil profiles change systematically along a slope/drainage transect? 

Provide examples of parent materials in our region.  How do they affect rates of pedogenic processes?

I'll think of more so keep checking this page

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