According to the text, the most important legacy of earlier civilizations was: urban development in europe was greatly expanded through the proliferation of: a. bigger walls around cities b. theater c. military force d. commercial trade one of the cities that grew and developed most rapidly during the 1800's and early 1900's was primarily due to its central location to the railway network and extensive trade in grain and meat packing a. new york city b. cleveland c. chicago d. st. louis rocks (even when they form buildings or city structures) undergo a process of physical disintegration and chemical decomposition called a. subsidence b. none of the choices are correct c. slumping d. weathering