Because they're all parallel 'slices' of a sphere . . . like the circumference and diameter
of the flat rounds you get when you slice an orange with parallel cuts.
Meridians converge at the poles and intersect the equator at 90 degrees. They are all great circle lines called lines of longitude. The equator is a line of latitude and the only line of latitude that is a great circle line. As you move away from the equator the lines of latitude describe smaller and smaller circles round the planet as you approach the poles.
There is only one line of latitude on the equator, and the equator is it.
Lines of latitude circle the earth, parallel to the equator.
lines of latitude
Lines that run parallel to the equator are called latitude lines or parallels.
Lines of latitude run parallel to the Equator (which is zero latitude).
You have answered the question for yourself ; They are 'Latitudes''. Longitudes (Meridians) are lines that run North to South from the North Pole to the South Pole. Longitudes come to a point at the poles, but spread out to a maximum at the Equator.
Lines of latitude are called parallels. The lines start at the equator and are located north and south of the equator.
The equator itself is a 'line' of latitude. All others are parallel to the equator.
The lines are latitude,heat equator and pressure belts.
lines of latitude
The equator itself IS a line of latitude.