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SCSC 301 TAMU Test 1 Questions and Answers (Latest Update 2025)
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SCSC 301 TAMU Test 1 Questions and Answers (Latest Update 2025)
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SCSC 301 TAMU Test 1 Questions andAnswers (Latest Update 2025)
Principle Components of Soil - Correct Answer ✅-Air 25%
-Water 25%
^ (healthy soil composition, those two vary from 50-0% to 0-
50%)
-minerals ~45%
-Organics ~5% (again healthy soil it varies)
% are by volume not mass
Soil - Correct Answer ✅Dynamic natural body having
properties due to the combined effects of climate and biota
as modified by relief acting on parent material over time.
5 thing that affect soil - Correct Answer ✅Active:
-climate
-biota
Passive:
-parent material
-time
,SCSC 301 TAMU Test 1 Questions and
Answers (Latest Update 2025)
Modifying:
-relief (topography)
Biosphere - Correct Answer ✅from roots to canopy, all
things living
Atmosphere - Correct Answer ✅from top soil on up
Lithosphere - Correct Answer ✅from top soil down
Soil - Correct Answer ✅from top soil to bedrock
Functions of Soil - Correct Answer ✅Medium for plant
growth
-Nutrients
-Support
-Water
-Oxygen (more absorbed through roots than leaves)
Regulates water flow (erosion)
,SCSC 301 TAMU Test 1 Questions and
Answers (Latest Update 2025)
Habitat for soil organisms (10^8-9 microorganisms in one
gram of soil)
Engineering medium (build with or on)
Soil Profile - Correct Answer ✅a vertical section of soil
through all its horizons and extending into the parent
material
Solum - Correct Answer ✅horizons A and B
Soil Horizons - Correct Answer ✅layer of soil about parallel
to the soil surface, differing in properties and characteristics
from adjacent layers above or below it.
Parent Material - Correct Answer ✅The bedrock that lies
beneath the soil horizons. Can be termed either C or R.
-C: bedrock can be dug when wet
-R:solid rock
, SCSC 301 TAMU Test 1 Questions and
Answers (Latest Update 2025)
Eluviated - Correct Answer ✅A horizons, clay moves out of
it
Iluviated - Correct Answer ✅B horizons, clay moves into it
Pedon - Correct Answer ✅Smallest 3-d unit of soil
measurments with all characteristics of soils. (smallest pedon
is 1m^2 and 2m deep)
Regolith - Correct Answer ✅everything unconsolidated;
A,B, and C horizons but never R horizon.
Colloids - Correct Answer ✅smallest soil particle (clay
sized)
-suspended in h2o
-very small
-large surface area per size
-very reactive
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