Across
- 6. Wood burns easily when exposed to fire
- 7. A renewable natural material from trees
- 8. Refers to how a material is built inside
- 10. The behaviour of a material when it reacts with acid or heat
- 11. Made from silica sand
- 12. Extracted mainly from rocks called ores
- 13. Man-made material often used for bottles
- 17. Colour, texture, and hardness are _______ properties
- 19. Comes from trees
- 20. An iron rod left outside for years without rusting shows
- 21. Describes how a material behaves when heated or burnt
Down
- 1. A natural resource often used for fuel
- 2. Made from petroleum and natural gas
- 3. A substance used to make products or objects
- 4. The ability to resist scratching
- 5. Materials can be classified as natural and
- 9. Property that lets a material bend and return to shape
- 14. Wood and cotton are examples of _______ materials
- 15. A natural material used in building and crafts
- 16. Obtained from the sap of a tree
- 18. Glass and steel are examples of _______ materials