Soil Horizons

Question 1

surface horizon with lots of organic material

Answer 1

O horizon

Question 2

horizon nearest the surface, has lots of mineral particles but is darker due to organic matter

Answer 2

A horizon

Question 3

the bleacher horizon where things are being leached out

Answer 3

E horizon

Question 4

underlying layers that have accumulated materials washed down from above or formed from weathering with little organic matter

Answer 4

B horizon

Question 5

the least weathered soils horizon

Answer 5

C horizon

Question 6

weakly developed B horizon, evidence of color and or structure development w/o clay accumulation

Answer 6

Bw - Cambic

Question 7

illuvial accumulation of silicate clays, clay films on peds, in pores, called clay skins or cutan

Answer 7

Bt - Argillic

Question 8

illuvial accumulation of humus and sesquioxides in coarse textured soils and cool climates

Answer 8

Bh, Bs, Bhs - Spodic

Question 9

weakly cemented, dense horizon, > 50% of upland soils in the loess region, usually loamy textured

Answer 9

Bx, Cx - Fragipan

Question 10

highly weathered, accumulation of low activity clays, Fe&Al oxides, very low & BS

Answer 10

Bo - Oxic

Question 11

A horizon that has been plowed

Answer 11

Ap

Question 12

dominent grey color (red splotchy)

Answer 12

Bg

Question 13

strong gleying (mottles caused by iron)

Answer 13

g

Question 14

illuvial accumulation of OM (caused by rain water flowing from one layer to another)

Answer 14

h

Question 15

accumulation of Fe and Al oxides

Answer 15

o

Question 16

plow layer

Answer 16

p

Question 17

illuvial (caused by rain water flowing from one layer to another) accumulation of sesquioxides (free iron oxides)

Answer 17

s

Question 18

silicate clay accumulation

Answer 18

t

Question 19

distinctive color without clay

Answer 19

w

Question 20

fragipan

Answer 20

x