A tile installer or tile setter.
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.
hydrologist
A Chronogist
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.
They call the tiles "bones." The pile of shuffled tiles is the "boneyard."
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
Catching tiles
A person who lays tile can be called a tile fitter or tile layer. Some people call it a tile mason, too.
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