The
vertical longitude lines are called meridians. Think
of these as hula hoops cut in half, attached from one pole
to the other. The longitude line numbers measure how far east
or west of the prime meridian a place is.
This prime meridian line runs vertically, right over Greenwich,
England, from the North Pole to the South Pole. It is numbered
as 0 degrees longitude. Numbers increase the further away
you move, up to 180 degrees. Longitude locations are given
as __ degrees east or __ degrees west.
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