heat goes from A. larger to smaller objects. b. warmer objects to cooler. c. cooler objects to warmed objects

They get pregnant at younger ages

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it