Soil science (profile horizons): In a standard soil profile, which horizon is composed mainly of weathered parent material with minimal alteration? Clarify that this horizon is little affected by translocation of materials or organic modification. Choose the correct option.
General Knowledge
World Geography
Difficulty: Easy
Choose an option
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AWeathered parent material that is not affected by translocation and organic modification
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BMaterial affected by translocation & organic modification
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CUnweathered bedrock
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DNone of the above
Answer
Correct Answer: Weathered parent material that is not affected by translocation and organic modification
Explanation
Given data
- Identify the soil profile horizon described only as weathered parent material with minimal pedogenic change.
Concept/ApproachThe C horizon consists mainly of weathered parent material that is only slightly affected by soil-forming processes. The A and B horizons are substantially modified by organic addition and translocation/illuviation, while R is unweathered bedrock.
Step-by-step identificationOption A → Matches C horizon description → Correct.Option B → Reflects A/B horizons (modified) → Incorrect.Option C → R horizon (unweathered) → Incorrect.
Final AnswerWeathered parent material that is not affected by translocation and organic modification