* The Earth's Axis: The Earth rotates around an imaginary line called its axis. The North and South Poles are the points where this axis intersects the Earth's surface.
* Longitude: Lines of longitude run from North to South Pole. They are used to measure degrees east or west of the prime meridian (which runs through Greenwich, England).
* Circular Shape: The Earth is a sphere, meaning it's a continuous circle. Therefore, there is no definitive "West" or "East" point where all longitude lines converge like they do at the North and South Poles.
Think of it this way: If you were to travel directly West from a point on the equator, you'd eventually end up back where you started after traveling all the way around the Earth.
