SWS3022 Lab Exam 1 Questions and Answers
What is the diameter of a sand particle? - Answer-2.0 - 0.05 mm
What is the specific surface area of a sand particle? - Answer-444 cm^2/g
What is the diameter of a silt particle? - Answer-0.05 - 0.002 mm
What is the specific surface area of a s...
SWS3022 Lab Exam 1 Questions
and Answers
What is the diameter of a sand particle? - Answer-2.0 - 0.05 mm
What is the specific surface area of a sand particle? - Answer-444 cm^2/g
What is the diameter of a silt particle? - Answer-0.05 - 0.002 mm
What is the specific surface area of a silt particle? - Answer-100,000 cm^2/g
What is the diameter of a clay particle? - Answer-<0.002 mm
What are the 3 particle size fractions? - Answer-Sand, Silt, and Clay
How many soil textural classes are there? - Answer-12
What is the specific surface area of a clay particle? - Answer-7,000,000 cm^2/g
The rate at which particles settle out of aqueous suspensions is dependent upon their
size, or more directly, their __________ - Answer-specific surface area
T/F
According to Stokes' Law, particles with a small specific surface area will settle out first -
Answer-T
The settling velocity of a particle (decreases/increases) in more viscous fluids - Answer-
decreases
T/F
A hydrometer measures the density of the settled particles. - Answer-F
A hydrometer measures the density (mass/volume) of a SUSPENSION
Define soil bulk density (provide units) - Answer-Soil bulk density is a measure of the
mass of soil per unit volume (g/cm^3) usually reported on an oven-dry basis
The greater the amount of void space, the (lower/higher) the weight for a given volume,
and the (lower/higher) the bulk density - Answer-The greater the amount of void space,
the lower the weight for a given volume, and the lower the bulk density
, What is the usual range of bulk density for typical mineral soils? - Answer-1 g/cm^3 - 1.6
g/cm^3
What can we infer about soils with bulk densities higher than 1.6 g/cm^3? - Answer-
Soils with a bulk density of higher than 1.6 g/cm^3 may indicate compaction and,
therefore, low porosity which tends to inhibit root penetration, water movement and gas
movement.
What can we infer about soils with bulk densities of below 1g/cm^3 - Answer-Soils with
bulk densities below 1g/cm^3 may indicate the presence of a high amount of organic
matter --> they are organic soils
What are the three general types of pores that can be found in soils? - Answer-
Macropores (>0.08 mm)
Mesopores
Micropores (<0.03 mm)
What kind of pores would you expect a sandy soil to have a lot of? - Answer-
Macropores
What are the components to Munsell Soil Color? - Answer-Hue, Value, Chroma
What does each component to the Munsell Soil Color indicate? - Answer-Hue -
Dominant spectra color on a given page
Value - Light/dark (the lower the number, the darker the color)
Chroma - Intensity/Brightness of color
Say I have a munsell soil color of 10YR 5/6, which of these parts represents the hue,
value, and chroma? - Answer-The 10YR represents the Hue
The 5/ represents the Value
The /6 represents the chroma
What differentiates the E1 from the E2 soil (or the E from the Eg) soil horizon? What
makes this difference? - Answer-Color.
E1 had a different color than E2 in that E1 was brown/orange and E2 was light in color.
The brown/orange color of the E1 horizon was due to the presence of iron oxides.
What material imparted the color to the E1? - Answer-Iron
What diffferentiated the Btg1 from the Btg2? - Answer-Clay content. Btg2 had a larger
clay content than Btg1. Btg2 was sandy clay loam while, Btg1 was sandy loam
The soil used for particle size determination last week was from the _____ horizon -
Answer-Btg
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