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.
Compared to other cities in San Francisco-Oakland-Hayward Metro, Concord has a relatively high percentage of Hispanic residents. In contrast, Concord has a smaller percentage of Hispanic residents than California, by 7.9%, but a larger percentage than the United States as a whole, by 13.4%.