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PLSC 204 Exam #1 questions with complete solutions graded A+
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PLSC 204 Exam #1 questions with complete solutions graded A+
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PLSC 204 Exam #1 questions withcomplete solutions graded A+
The underlying reason why the Mesopotamian civilization died out is ___ - correct answer ✔✔salinity
caused by over irrigation
The Greek, Roman, and other Mediterranean civilizations declined primarily due to ___ - correct answer
✔✔soil erosion
Define what is meant by the Agricultural Transformation - correct answer ✔✔It signaled a change from a
nomadic lifestyle to a sedentary one, ie., development of permanent residences and villages.
Three fundamental functions of soils - correct answer ✔✔Planting material, home to soil organisms,
engineering material
Match each master horizon designation with its corresponding description - correct answer ✔✔E -
Highly eluvial horizon; bleacher appearance
R - Considered "parent material"; I can't dig this
A - Dark color due to coatings of organic matter
O - non-mineral horizon, e.g., leaf litter
B - Illuvial horizon; often clay-rich; particles typically have oxide coatings
C - Unconsolidated "parent material"; I can dig this
Natural mineral souls in humid regions with considerable rainfall generally have pHs in which range? -
correct answer ✔✔4-7
Approximately what percentage of an ideal soil's volume should be occupied by pores? - correct answer
✔✔50%
, Clays are largely responsible for providing which of the following properties? - correct answer ✔✔Water
retention, nutrient retention
Which is the following is not an essential plant nutrient? - correct answer ✔✔Cadmium - Cd
List the five soil-forming factors - correct answer ✔✔Parent material, climate, biota, topography, time.
List the four soil-forming processes - correct answer ✔✔Additions, losses, translocations,
transformations
Dark colored minerals are particularly rich in which two plant nutrients? - correct answer ✔✔Iron and
magnesium
In general, light-colored materials such as quartz and feldspars weather more readily than do dark-
colored minerals - correct answer ✔✔False
Biochemical weathering is generally more important in soil formatting than is physical weathering -
correct answer ✔✔True
Soil formation on slopes is retarded by which of the following? - correct answer ✔✔Reduced effective
rainfall and erosion
As a result of the last Ice Age, many soils in northern and high elevation locations in the US are derived
from which type of parent material? - correct answer ✔✔Till
Which of the following best characterized the progression of soil moisture regime as one moves from the
eastern to western US? - correct answer ✔✔[east] udic-ustic-aridic-xeric [west]
Soils forming from hard rock material are estimated to take 10,000 to 100,000 years to become fully
mature - correct answer ✔✔True
Forest soils tend to have a thinner A horizon than do prairie grassland soils - correct answer ✔✔True
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