The informal sector lacks land, capital, and technology, and can be less productive than formal enterprises, however, it can improve individual earnings and add money into the economy. It is the access to the market and power to purchase that can assist the productivity of the informal worker. If products can be sold on a cheaper mass scale to informal workers to use as a resource, this could help improve this sector to be more meaningful.
London is closer to Europe than Dover.
The answer is B. In a destructive plate boundary, the descending plate, usually the oceanic plate begins to melt as it descends below into the mantle. This forms magma that rises and erupts onto the overlying continental plate through fissures. This volcanic activity is responsible for geographical features such as the volcanic island arc, which lies parallel to the subduction zone.
Elevation sorry if I’m wrong