Following are examples of three metamorphic rocks and a list of their uses. Marble is a metamorphic rock that is used to make floor tiles, counter tops and it is carved into statues and was used extensively in the building of the Roman Colosseum and other historic buildings. Slate is another metamâ¦.
A hex key, Allen key or Allen wrench is a tool of hexagonal cross-section used to drive bolts and screws that have a hexagonal socket in the head (internal-wrenching hexagon drive).
The number lock key has been virtually replaced by separate navigational and numerical entry keypads. The SysRq key never had a function â it was created strictly for a future function that did not materialize. Many computer keyboards don't include a scroll lock key, although a few do, perhaps for nostalgic purposes.