Soil Science Quiz Answers
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School
California Polytechnic State University, San Luis Obispo *
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Course
121
Subject
Geology
Date
Apr 3, 2024
Type
Pages
6
Uploaded by BarristerElk3994
QUIZ ANSWERS A crystalline rock has small crystals and relatively low quartz content. This is most likely a basalt
type rock, and it will weather relativel
y quickly to form a soil as compared to other crystalline rocks. (Basalt, quickly) In millimeters (type in the numerals - if less than zero, use a zero before the decimal, formatted like 0.0001 or 0.1), the largest a particle of silt can be is 0.05 mm, and the smallest a particle of silt can be is 0.002 mm. Which of the following are plant essential elements supplied by soil minerals to plants? (Ca, K)
Organic matter is defined by chemistry based on rings and chains of (carbon),
whereas mineral soil material does not have this type of chemical structure. Which of the following rock types is most likely to weather quickly through dissolving, especially in the presence of acids? (Limestones)
Which of the following are part of the definition of soil as discussed in lecture? (3D, Vertically differentiated (has layers))
Compared to the air we breath above ground, soil atmosphere has relatively LOWER
amounts of oxygen and relatively HIGHER amounts of carbon dioxide. Which of the following is the best description of "loam"? (
A mixture of sand, silt, and clay)
Which of the following are functions of soil as discussed in lecture? (Water supply regulation, Medium for plant growth)
Granite tends to weather to soils that are- Infertile and coarse textured (big crystals), infertile (not essential)
Parent materials from weathered basalt result in-
Fine-textured soils (small crystals) containing K, Mg, and Fe The most common rock type underlying soils is- Sedimentary 2/3 of all soil sitting on this rock
How does permeability impact effective precipitation (EP) on a sloping soil? low permeability (eg clay soils) have lower EP Match each horizon designation with its designation:
Bt
Subsurface horizon with accumulation of clay
Cr
Soft weathered bedrock
Bn
Subsurface horizon with accumulation of sodium n terms of some key roles organisms play in soil formation, Animals
commonly mix soil,
bacteria and fungi are involved in chemical reactions and breaking down organic matter,
and Plants add carbon to the soil. The surface horizon of a soil is made primarily of mineral material. It is relatively light in color and rich in bases. It is about 10 cm thick. Exact carbon levels have not been measured. Which epipedon(s) might this soil have? Mark all that apply.
Correct Answer
Ochric You Answered
Histic
Folistic
Mollic
Question 2
0 / 2 pts
A soil has a subsurface accumulation of clay along with evidence that the clay has been transported there. It also has columnar structure. It has relatively low levels of calcium carbonate, and is not cemented. Sodium levels have not been measured. Which endopedon(s) might this soil have? Mark all that apply.
Correct Answer
Argillic
Correct!
Natric You Answered
Calcic
Duripan
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Question 3
2 / 2 pts
Using Darcy's law, what is the saturated hydraulic conductivity of a soil (in cm/hour) if, under a total gradient of 37 cm of head, a flux of -120 cm/hour is measured from a column of soil 15 cm in length? Give answer with one decimal. Enter only the numerical value (don't type in units).
Correct!
Correct Answers
48.6 (with margin: 0.3)
-48.6 (with margin: 0.3)
Question 4
0 / 2 pts
Some water in a soil has a potential -420 kPa. Which of the following are true of this water? MARK ALL THAT APPLY
This water is considered hygroscopic
This water is considered gravitational
Correct!
This water could be taken up by plants You Answered
This water could be drained from the soil by gravity
Question 5
0 / 2 pts
What is the soil order for a soil with the following full taxonomic name?
Coarse-loamy over sandy or sandy-skeletal, mixed, superactive, nonacid, frigid Typic Endoaquepts
You Answered
Alfisols
Endosols
Correct Answer
Inceptisols Spodosols
Gelisols
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