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Soil science (shrink–swell clays): The heavy clay soils that show marked expansion when wet and contraction when dry are called what? Note: 'heavy day soils' in the prompt refers to heavy <em>clay</em> soils (typo clarified). Choose the correct soil order.

Q: Soil science (shrink–swell clays): The heavy clay soils that show marked expansion when wet and contraction when dry are called what? Note: 'heavy day soils' in the prompt refers to heavy clay soils (typo clarified). Choose the correct soil…

Concept Vertisols are clay-rich soils (e.g., black cotton soils) with high shrink–swell capacity, forming deep cracks when dry and expanding when moist. Aridisols are arid-region soils; Histosols are organic; Andisols form from volcanic ash.

Difficulty: Easy

Aridisols
Vertisols
Histosols
Andisols

Correct Answer: Vertisols

Explanation:

Concept
Vertisols are clay-rich soils (e.g., black cotton soils) with high shrink–swell capacity, forming deep cracks when dry and expanding when moist. Aridisols are arid-region soils; Histosols are organic; Andisols form from volcanic ash.

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