Final answer:
The prime meridian is a longitude line that divides the Earth into the Eastern and Western Hemispheres. It is located at 0° longitude and runs through the Royal Observatory in Greenwich, England.
Step-by-step explanation:
The prime meridian is a longitude line that runs through the Royal Observatory in Greenwich, England. It divides the Earth into the Eastern and Western Hemispheres. The Eastern Hemisphere includes Europe, Asia, and Australia, while the Western Hemisphere includes North and South America. The Prime Meridian is defined as 0° longitude.