The prime meridian.
longitude lines?
lines of longitude
Each 'meridian' is a line of constant longitude.
I think its called the equator.
These invisible lines that circle the earth and are vertical or running north to south are longitude or meridian lines. These lines are also perpendicular to lines called latitudes that are parallel to the equator.
Lines of Longitude
the lines on the globe are called longitude and latitude lines the longitude lines go up and down while the latitude lines go left to right
Longitude is the best term, but sometimes meridian is used. The line of longitude at zero degrees is the Prime Meridian.
lines of longitude
meridians
latitude and longitude
Yes, lines of longitude are also known as meridians. For example: 0° longitude is the the prime meridian.