Answer:
Generally speaking, rocks in the southwestern U.S.A tend to be much older and more eroded than those found in the northeast. The rock outcrops and exposures in this region will likely consist of sedimentary layers that have been exposed due to erosion over time, as well as some ancient igneous intrusions such as granite or basalt. In comparison, the northeastern U.S.A tends to contain younger rocks with fewer signs of weathering and erosion; these outcrops and exposures may include a variety of metamorphic rocks such as slate or gneiss along with granites from nearby mountain ranges like the Appalachians or Adirondacks.