Assembly would be a name for putting things together.
The person is a steel-worker.
it will heat as long as the gas is on and your pilot is still lit, you would have to call your gas company to turn it off.
Horologist .
Umpires
A tile installer or tile setter.
Tiles are the "square things". Altogether, the tiles make up the floor.
That person is a litter-lout, who is littering by dropping rubbish on the floor.
A picture made with with tiles and stone is a mosaic.
In the UK we call it the ground floor.
In America, a flat is an apartment. You might call that person an apartment dweller, a tenant, a renter, or in the case of a coop, they would be called the owner.
Google "replacement floor tiles". Example of what may be found: www.stonelocator.com. or google "floor tile replacements" Examples found: http://www.thisoldhouse.com/toh/skill-builder/0,,20057064,00.html
They call the tiles "bones." The pile of shuffled tiles is the "boneyard."
Catching tiles
Call a terrazzo floor installer.
Call the local home Depot & ask to talk with someone in Dept #23 Floor & wall.. They can recommend a pre mixed Mastic & give you the bucket sizes available & cost
The cost of the removal of a ceramic tiled floor can vary depending on the company used and size of the area that the floor covers. It is best to call different contractors to obtain estimates before settling on one. One may also save some money by breaking the tiles up themselves, and then hiring someone to remove the grout.