A microkernel implements all drivers as user-space programs, and implements core features like IPC in the kernel itself. A monolithic kernel, however, implements the drivers as a part of the kernel...
Porcelain is made with kaolin clay. Kaolin is white clay that retains its white color when fired. It is fired at temperatures in excess of 1300 C and is more fully vitrified than stoneware. It is usually covered with a clear glaze, which allows the white body to show.
There are differences between ceramic and porcelain tiles that cause lots of confusion! Here are the differences, SIMPLIFIED! Ceramic Tiles: Are made with clay, minerals and water. These tiles are then fired and glazed because the ceramic is porous. This is where the color and look comes from. When coated with a glaze of grade III or higher, they are extremely resistant to scratching. Easier to install than porcelain.