What does David Smith mean by a “world city (aka Global Cities)” What role do they play in the global system?

Explanation:

A world city, also known as global city or occasionally referred as alpha city or world center, is a city which is a primary node in the global economic network. This cities have enormous power globally. They are the places where all the global economy takes place, all the international deals, allia.

sediment layers stop spreading when they reach a barrier or they run out of sedimentary material. lateral spreading is the movement of gently to steeply sloping, saturated soil deposits caused by earthquake-induced liquefaction. i hope this . : )

answerinternational border(ib);