____ walls use locally gathered soil, often combined with some Portland cement that is compacted into removable forms with the aid of hand tools or power machinery.

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Rammed earth construction involves compacting a mixture of locally sourced soil and a stabilizing agent like Portland cement in removable forms, either manually or with machinery, to create solid walls. This method is known for its sustainability and durability.

____ Walls Use Locally Gathered Soil, Often Combined with Some