Which of the following statements describes longitude lines on a map?

Longitude lines, also known as meridians, run vertically on a map. They extend from the North Pole to the South Pole and are used to measure the distance east or west from the Prime Meridian, which is designated as 0 degrees longitude. This vertical arrangement allows longitude lines to help define time zones and geographic locations across the globe.

Meanwhile, latitude lines run horizontally and indicate distances from the equator. The significance of longitude lines is equal to that of latitude lines, as both are essential for navigation and understanding geographical coordinates. Thus, the statement that longitude lines run vertically accurately describes their orientation and function on maps.