Across
- 4. a metal made by combining two or more metallic elements
- 7. are pure materials in their most basic form. They cannot be broken down into different constituents.
- 8. rocks from which metals can be extracted
- 9. Iron or steel are_____
- 11. an imaginary surface
- 12. a type of steel not needing a protective coating and does not rust
Down
- 1. is a transparent, brittle material that is made from silica,
- 2. a building material made from a mixture of broken stone or gravel, sand, cement, and water,
- 3. inclined
- 5. is a binder, a chemical substance used for construction that sets, hardens, and adheres to other materials to bind them together.
- 6. Fe
- 10. is a reddish- or yellowish-brown flaking coating of iron oxide that is formed on iron or steel by oxidation