Final Take Home Test
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The best definition for a soil horizon is a. a uniform layer of soil b. a 2-dimensonal cross section exposing the soil layers c. an area of topsoil with similar properties d. a detailed list of soil fertility characteristics
a. a uniform layer of soil
Soil is: a. weathered rock and mineral material only b. incapable of sustaining microbial life c. the result of six major soil forming factors d. composed of organic matter, minerals, water, and air
d. composed of organic matter, minerals, water, and air
The five soil forming factors are: a. rocks, minerals, topography, weather, time b. parent material, weather, organisms, slope, temperature c. geology, climate, slope, vegetation, animals d. parent material, climate, topography, organisms, time e. rainfall, topography, parent material, organisms, climate
d. parent material, climate, topography, organisms, time
The parent material for the southeast region of Ohio is: a. residual sandstone and shale b. lacustrine materials c. high limestone glacial till d. low limestone glacial till
a. residual sandstone and shale
Soil texture refers to: a. the arrangement of primary soil particles into larger particles b. the proportions of sand, silt and clay c. the ease with which the soil is crushed or crumbled d. the amount of pore space in the soil
b. the proportions of sand, silt and clay
The smallest size soil particles are a. silt b. clay c. sand d. gravel
b. clay
A soil with a bulk density of 1.1 g/cc would have _______ pore space compared to a soil with a bulk density of 1.5 g/cc. a. more b. less c. the same
a. more
Soil structure refers to: a. the arrangement and aggregation of primary soil particles into larger particles b. the proportions of sand, silt, and clay c. the ease with which the soil is crushed or crumbled d. the amount of pore space in the soil
a. the arrangement and aggregation of primary soil particles into larger particles
A soil that has VERY poor drainage would have subsoil which is: a. bright and uniform in color b. mottled with different colors c. red in color d. black in color e. dull gray in color
e. dull gray in color • due to iron not rusting*
In SATURATED water flow in soils: a. does not move soil nutrients b. the force puling the water is gravity c. water moves from regions of low moisture tension to regions of high tension d. both a. & b.
b. the force puling the water is gravity
Earthworm holes, animal burrows and chisel openings will aid in FREE water movement through the soil: a. at any location b. only when they are open to the surface c. only when they are covered at the surface d. they don’t help with water movement at all
b. only when they are open to the surface (Remember the old early 1900’s video of sand and water in class.)
The arrangement and aggregation of primary soil particles into larger particles in known as _______.
Soil Structure