Final answer:
Earth is divided into its Eastern and Western Hemispheres by the prime meridian.
Step-by-step explanation:
Earth is divided into its Eastern and Western Hemispheres by the prime meridian. The prime meridian is the line of longitude that runs through the Royal Observatory in Greenwich, London. It serves as the reference point for measuring longitude and separates the Eastern Hemisphere, which includes parts of Europe, Africa, Asia, and Oceania, from the Western Hemisphere, which includes parts of North and South America.
Learn more about Eastern and Western Hemispheres