Final answer:
Meridians of longitude run from pole to pole on the global grid, with the Prime Meridian as the reference point.
Explanation:
Meridians of longitude are the lines that run from pole to pole on a global grid, connecting all points at the same longitude. These lines are great circles and are not parallel to each other, converging as they near the poles. The Prime Meridian is the starting point for measuring longitudes, passing through Greenwich, England.
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