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Lines of longitude meet at the poles, both North and South. At the North Pole, all lines of longitude converge and meet at a single point. The same holds true for the South Pole, where lines of longitude also converge and meet at a single point.
On a globe, parallels and meridians meet at right angles only at the equator and the poles. On a Mercator projection map, all meridians intersect the equator at right angles, while parallels intersect meridians at right angles throughout the map.
they are both the same lines.
All lines of latitude meet at the Earth's poles, specifically the North Pole and the South Pole.
All lines of longitude converge at the North Pole, meaning they meet at a single point. This unique point does not have a defined longitude as all lines converge there.