interphase soil processes – Flashcards
Unlock all answers in this set
Unlock answersquestion
| the chemically significant components of the soil atmosphere |
answer
| -CO2-O2 |
question
| why CO2 is important in soil |
answer
| impacts solution pH |
question
| why O2 is important in soil |
answer
| impacts redox status |
question
| when gases readily diffuse thru the soil |
answer
| under water-unsat conditions |
question
| the effect of carbonic acid in rain and soil |
answer
| makes rain naturally acidic and hastens the weathering of soil minerals |
question
| the role of oxygen concerning redox statur |
answer
| oxygen is an oxidizing agent (electron acceptor) |
question
| the type of environment in the presence of oxygen |
answer
| oxidizing (aerobic) |
question
| the type of environment in the absence of oxygen |
answer
| reducing |
question
| why there's reducing conditions in water-saturated soil |
answer
| the low water solubility of O2 |
question
| what happens as a result of the degradation of biopolymers and the dissolution (aka weathering) of minerals in soil? |
answer
| the products of this breakdown get released into the soil solution and many reprecipitate to form relatively stable minerals, such as hydrous metal oxides |
question
| dissolution |
answer
| weathering of soil minerals |
question
| exchangeable ions |
answer
| ions in solution that are attracted to inorganic and organic surfaces by relatively weak electrostatic forces |
question
| adsorbed substances |
answer
| soluble substances that form direct chemical bonds with soil particle surfaces |
question
| hydrophobic partitioning |
answer
| mechanism of retention where a substance is essentially repelled from the polar soil solution and partitions into the nonpolar molecule framework of soil organic matter |
question
| the 7 elements that constitute 98% of the mass of soils |
answer
| -O -C -Si -Al -Fe -Ca -K |
question
| the phase change that occurs in soils during synthesis |
answer
| going from soil atmosphere or soil solution to soil solids |
question
| the phase change that occurs in soils during decay |
answer
| going from soil solids to soil atmosphere or soil solution |
question
| the phase change that occurs in soils during precipitation |
answer
| going from soil solution to soil solids |
question
| the phase change that occurs in soils during weathering |
answer
| going from soil solids to soil solution |
question
| ion exchange in soils |
answer
| exchange of ions between soil solution and soil solids |
question
| the phase change that occurs in soils during adsorption |
answer
| going from soil solution to soil solids |
question
| the phase change that occurs in soils during partitioning |
answer
| going from soil solution to soil solids |
question
| the phase change that occurs in soils during desorption |
answer
| going from solid phase to soil solution |
