Soils Exam Two

Helpfulness: 0
Set Details Share
created 8 years ago by ndc33
1,779 views
Soil Formation Soil Colloids
Grade levels:
College: Third year
show moreless
Page to share:
Embed this setcancel
COPY
code changes based on your size selection
Size:
X
Show:
1

Silicate clay accumulation is most common in the _______ horizon

B

2

Illuvial horizon

B

3

Eluvial horizon

A,E

4

Silicate clay leaching is most common in the _____________ horizons

A,E

5

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

soil pedon

6

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

7

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

Loess deposits

8

Argillic horizons are characterized by

accumulation of silicate clays

9

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

clay

10

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

Isomorphous substitution of Mg for Al in the octahedral sheet

11

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

12

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

Vertisols

13

Which of the landscape positions would have the greatest horizonation?

botttomland

14

Define CEC

the sum of exchangeable cations a soil can adsorb