Natural stone walls are characterized by

• A. Laid with mortar
• B. Laid with concrete boards
• C. Precast from cement
• D. Blocks with Mortar

Answer: (A)

Natural stone walls rely on mortar to bind the stones and fill gaps, creating a stable, load‑bearing mass. Mortar acts as an adhesive and bedding that accommodates irregular shapes and sizes, distributes loads, and helps shed water, giving the wall weather resistance and structural integrity. The other materials described aren’t used for traditional natural stone masonry: concrete boards are sheet backing materials, precast cement elements are manufactured concrete components, and using blocks with mortar describes masonry with uniform blocks rather than natural stones. (Note that some dry‑stone walls use no mortar at all, but when describing natural stone walls in typical construction, laying with mortar is the defining method.)