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.
Many sell them as both being the same in which they aren't. The Sandwich design is more complex and intricate in it's detail where Anchor Hocking amber is not. The pattern that is often mistaken is actually called Concord. It's a nice lacy pattern. Tiara Amber Sandwich Crystal has a deep amber glow and the other has a light yellow color. You can be fooled if you don't study before buying. Tiara made many designs of glass. Indeed you might have Tiara but the difference between is the design name, mine being sandwich. Tiara glass was made from 1970 to 1998.