Black cotton soil is unsuitable for foundations because its

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Black cotton soil is unsuitable for foundations because its Answer: property to undergo a volumetric change due to variation of moisture content.

Question context

This question is part of 🚧 Civil Engineering within the broader 🛠️ Engineering Essentials subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.