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.
When the word Lilac is mentioned, most folks will think of Syringa vulgaris cultivars, or French Hybrid Lilacs. They are indeed, some of the most popular, offering somewhere over 400 different cultivated varieties, in colors ranging from white to blue to purple, and even yellow.