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2. ( 5.0 points )The cost of the natural stone used in buildings is comparatively cheaper than brick and concrete.
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3. (5.0 points )Masonry includes both natural materials and manufactured products.
4. (5.0 points )Woods such as fir, pine and redwood are mainly used for interior decoration, such as floors.
5. (5.0 points )Steel is outstanding as a structural material, because it never deforms and can thus be used in skyscrapers.
6. (5.0 points )The mixture of water, sand and gravel can be compressed into concrete.
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