Quiz 2 Answers

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Quiz 2 - Answers

• 1. What are the two steps considered to be
  overlapping steps in the process of soil genesis,
  according to the Simonson article?
• a) accumulation of parent material
• b) differentiation of horizons in the profile
• 2. List 4 of the 6 chemical weathering reactions.
  For one of these, please describe the process,
  especially as related to the importance of water.
  
• 1) hydration new mineral forms water becomes
  tightly associated with mineral H bonds
  mineral organized around H2O
• 2) hydrolysis H2O splits and H replaces a
  cation
• 3) dissolution H2O hydrates cations and anions
  until they become dissociated from each other
  (lower energy)
• 4) carbonation
• 5) oxidation/reduction all use water as medium
• 6) complexation
• 3. Compare colluvium, glacial till, and alluvium
  by explaining how they differ in appearance and
  agency of transport. Appearance Transp
  ort
• colluvium course, poorly sorted,
  heterogeneous by gravity
• (sharp edges)
• glacial till course, poorly sorted,
  heterogeneous by ice
• (more smooth than colluvium)
• alluvium sorted by size (smooth) by streams

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Chapter 4 Groups for teaching

• Starting Page
• Group 1 Soil Color 122
• Group 2 Soil Texture Size and Surface
  Area 123
• Group 3 Soil Structure Types 133
• Group 4 Soil Structure Density (particle and
  bulk) 136
• Group 5 Soil Structure Pore Space (factors and
  size) 147
• Group 6 Soil Structure Aggregates (formation
  processes) 152
• Group 7 Tillage and Mngmt Conventional and
  Conservation 160
• Group 8 Tillage and Mngmt Conditioners 164
• Group 9 Soil Properties and Engineering
  Consistency/Consistence and Strength 165
• Group 10 Soil Properties and Engineering
  Settlement 168