Elements of the nature and properties of soils: Soils Exam Two Flashcards
Silicate clay accumulation is most common in the _______ horizon
Silicate clay leaching is most common in the _____________ horizons
a three-dimensional unit that embodies the primary characteristics of an individual soil
The swelling/shrinking tendency of some silicate clay minerals is due primarily to
the movement of water molecules in and out of the interlayers of the crystal
Glacial parent material deposited in MS during the Pleistocene era consists of
Argillic horizons are characterized by
accumulation of silicate clays
Secondary minerals are most prominent in the __________ fraction of soils.
The negative charges associated with smectite clay crystals are due mostly to
Isomorphous substitution of Mg for Al in the octahedral sheet
Some soil colloids exhibit positive charges under highly acid conditions. To what are these charges likely due?
Protonation of some hydroxy groups by excess H+ ions
Among the soils of which order would you most likely find the highest buffering capacities?
Which of the landscape positions would have the greatest horizonation?
the sum of exchangeable cations a soil can adsorb