A fall line is an upland region of the coastal plains meets and the term states that lots of rivers fall from this Piedmont to the coastal plain making rapids with waterfalls.
These falls are important as for the settlement as they block the ocean going ships from entering in any further upstream and also provided water power to run the region industries.
La característica en común es que esos países subdesarrollados concentran la mayor cantidad de empleos en el sector terciario o de servicios. Espero que te ayude!
