SCSC-301 : Exam 1
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.A common primary silicate mineral which weathers to form secondary silicate minerals in soils is: - ANSWER-hematite
.A common primary silicate mineral which weathers to form secondary silicate minerals in soils is: - ANSWER-mica
...
.A common primary silicate mineral which weathers to form secondary silicate minerals in soils is: -
ANSWER-hematite
.A common primary silicate mineral which weathers to form secondary silicate minerals in soils is: -
ANSWER-mica
.A major assumption made in applying Stoke's Law to sedimentation of soil particles in a cylinder is: -
ANSWER-particles will separate based upon density
.A passive soil forming factor is: - ANSWER-time
.A primary silicate mineral that dominates in the sand and silt fraction of most soils is: - ANSWER-quartz
.A principal role of oxygen in soils is: - ANSWER-oxidation of iron
.A principal role of oxygen in soils is: - ANSWER-oxidation of iron
.A property used in distinguishing among minerals in hand specimens is: - ANSWER-cleavage
.A property used in distinguishing among minerals in hand-held specimens is: - ANSWER-hardness
.A rock typically contains a higher percentage of ____________ than a soil which is derived from the
rock. - ANSWER-silicon
, .A sample soil has a wet mass of 50g, a dry mass of 42g, a bulk volume of 30 cm3, and a particle density
of 2.6g/cm3. Calculate the total porosity of the soil. - ANSWER-wet/dry=BD
50/42=1.2
(1.2)BD/PD(2.6)=.46
.A soil has a bulk density of 1.3g/cm3, a particle density of 2.6g/cm3, a total porosity of .46, and a
gravemetric water content of .20. Calculate air filled porosity: - ANSWER-BD(1.3)*GWC(.20)=.26
TP(.46)-.26=.20
.A soil having A, B, and C horizons and a textural profile has horizons which are loam (l), clay loam (cl),
and clay (c). The order of occurrence of these materials in the A,B, and C horizons would be: - ANSWER-l,
c, cl
.A soil having A, B, and C horizons and a textural profile has horizons which are loamy sand (ls), sandy
clay loam (scl), and sandy clay (sc). The order of occurrence of these materials in the A, B, and C horizons
would be: - ANSWER-ls, sc, scl
.A soil horizon in which the supply of gases is adquate for optimum biological activity is said to: -
ANSWER-be well aerated
.A soil property that is not affected by tillage is: - ANSWER-particle density
.A soil typically contains a higher percentage of ____ than a rock which the soil is derived from: -
ANSWER-aluminum
.A soil typically contains a higher percentage of ___________ than a rock which the soil is derived from. -
ANSWER-aluminum
.A sorted, transported parent material that may contain coarse fragments is: - ANSWER-alluvial
.A typical moist surface soil contains approximately 25% by volume is: - ANSWER-air
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