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Soils Exam Two

front 1

Silicate clay accumulation is most common in the _______ horizon

back 1

B

front 2

Illuvial horizon

back 2

B

front 3

Eluvial horizon

back 3

A,E

front 4

Silicate clay leaching is most common in the _____________ horizons

back 4

A,E

front 5

a three-dimensional unit that embodies the primary characteristics of an individual soil

back 5

soil pedon

front 6

The swelling/shrinking tendency of some silicate clay minerals is due primarily to

back 6

the movement of water molecules in and out of the interlayers of the crystal

front 7

Glacial parent material deposited in MS during the Pleistocene era consists of

back 7

Loess deposits

front 8

Argillic horizons are characterized by

back 8

accumulation of silicate clays

front 9

Secondary minerals are most prominent in the __________ fraction of soils.

back 9

clay

front 10

The negative charges associated with smectite clay crystals are due mostly to

back 10

Isomorphous substitution of Mg for Al in the octahedral sheet

front 11

Some soil colloids exhibit positive charges under highly acid conditions. To what are these charges likely due?

back 11

Protonation of some hydroxy groups by excess H+ ions

front 12

Among the soils of which order would you most likely find the highest buffering capacities?

back 12

Vertisols

front 13

Which of the landscape positions would have the greatest horizonation?

back 13

botttomland

front 14

Define CEC

back 14

the sum of exchangeable cations a soil can adsorb