1 inch minimum. Most poolplayers will agree that the thicker the slate, the more consistent the table will be. That is why experienced poolplayers that can both afford it and have a room to support it, will have a table with 1.5 inch, and even 2 inch slate. However, most tables are 1 inch slate and most poolplayers would agree that they cannot tell the difference from 1 inch to 1.5 inch. Thinner tables are made, and most will argue that you can tell the difference.
The first difference is cost, as slate tables cost more. The second difference is weight, as a slate table weighs more than non-slate. The third difference is "playability". A non-slate table and a slate table that has less than one inch slate will not provide the same tolerances and ball reactions as compared to a quality one inch slate table. This third item is the reason all regulation pool tables are required to have one inch slate.
10mm
This is a subjective answer - the important thing is to get a quality table and get it set up by a qualified professional. Any table sold with 1.5 inch slate you can be certain is a well manufactured table. However, the much more common 1 inch slate tables you generally are getting what you pay for. Although Brunswick is the biggest name in pool tables, you can get a high end table from another that costs less and is just as good as the Brunswick.
There is a thick book on the table.
about 4 inches thick
plank
Flagstone is a very general term that denotes a large flat stone that is between one and four inches thick, especially one used for paving. Stones of this nature are created by splitting or cutting. The primary types of flagstones are sandstone, limestone, granite, slate or quartzite.Slate, on the other hand, is a type of rock. You can make flagstones out of slate. Some flagstones are slate, but not all. Not all pieces of slate are flagstones.
Placing the cords and wires away from the table so that there is safety from the feet of the operator and also have a thick table to separate the two.
A hard and thick slab of plastic.
any of the metalloids. find a periodic table. there should be a thick line that looks like a set of stairs towards the right side of the table. any element along that line is a metalloid.
It depends on how thick
Depending on how comfortable you are using a table saw, you can do it free hand or with the miter gauge. Use a 6 inch piece of 2x6 and run it through at an angle. Usually about 1/4 inch thick on the thick end.