City planners are breaking ground on a new city that many people are hoping will become an important ocean port for trading. learning from the example of new orleans, louisiana, which geographic factor should the city planners pay the most attention to for the future safety of the city?
the city's proximity to a body of freshwater

the city's access to a nearby major railroad hub

the depth of the city's harbor for large barges

the city's elevation above or below sea level

20 points “the creation of a mosaic was a complicated procedure that called for careful timing and teamwork. . walls were painted with resin or tar before being covered with the first of three layers of plaster. . a sketch of the projected work was then made on the plaster to serve as a guide for the various artisans. the outermost layer of plaster, in which the pieces, or tesserae, of the mosaic would be set, was spread on only enough area to contain a day’s work. some of the tesserae—small, carefully cut fragments of colored glass, marble, and semiprecious stones—were pressed into the wet plaster so that they projected at a slight angle. the stones thereby better reflected light and imbued the finished mosaic with a shimmering life of its own.” —empires besieged: time frame a.d. 200–600 how many layers of materials were under the tiles? a. two- c. four- b. three- d. five