What do we call: (use the words from the list below)

(bracing , contractor , hydraulic, aluminium, exterior,

load, fabricate ,scaffolding, design, core, demolition, charge ,

commercial building, brick, depth, surface, crane,

basement, derrick, superstructure).

1. the person or organization signatory to a contract to do certain work within a specified time for payment.

2. a silvery grey metallic element with good corrosion resistance used in many light alloys.

3. structure members to stiffen it or to resist wind forces.

4. hydraulically powered tool on the jib of an excavator.

5. something outer or external.

6. an action applied to a structure, artifact or its surroundings.

7. construct or manufacture by a fabricator.

8. a broad class of mechanical devices for lifting and moving heavy loads.

9. a crane with a vertical mast.

10. the process of knocking down or pulling a building.

11. the distance from a surface innards.

12. a small rectangular block of fired clay used in building.

13. the part of a building or other structure above the foundation.

14. the outside part or uppermost layer of something.

15. having most of the space used for commerce; often including stores, offices, libraries, churches, museums, warehouses, government buildings etc.

16. a temporary structure to provide access or protection to temporary works; may be in timber or made of tubular steel poles.

17. to formulate an idea and turn it into a practical reality as a structure.

18. central or most important part of something.

19. a quantity of explosive inserted in a drill hole in a blasting operation.

20. the underground storey of a building.