There are three main types of plate boundary: divergent, convergent and transform. Plates move away from one another at divergent boundaries. This happens at mid-ocean ridges. Plates move towards one another at convergent boundaries; one plate is forced below another in a process called subduction.
The skin of a Concord grape is typically dark blue or purple, and often is covered with a lighter-coloured epicuticular wax bloom that can be rubbed off. It is a slip-skin variety, meaning that the skin is easily separated from the fruit. Concord grapes have large seeds and are highly aromatic.
Black granite can be marbled in other colors such as white or rose. Black granite is mined in Sweden, South Africa, India or Australia. Azul or Blue Granite. Azul or blue granite is so named because it has blue in the granite stone. The exact name of the stone depends on the country of origin.