| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | metallurgy | ancient civilizations in Africa | Metallurgy has been a crucial part of cultural and technological advancements, with significant contributions made in the development of metal tools and artifacts. | 1 |
| 2 | sheet metal | Africa | Less commonly used due to reliance on traditional building materials like adobe, mud brick, or thatch | 1 |