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What is an imaginary line passing through the Royal Observatory in Greenwich, England, which marks the 0° line of longitude called?

1. Prime Meridian

2. Reefs

3. Rivers

4. Time Zones

The correct answer is: Prime Meridian

The correct answer is the Prime Meridian. This is a significant geographical marker in the field of navigation and mapping. The Prime Meridian is defined as the line of 0° longitude from which all other longitudes are measured east and west. It runs through the Royal Observatory in Greenwich, England, and serves as a reference point for timekeeping, helping to establish time zones around the world. The other options, while relevant to geography and navigation in various ways, do not represent the concept of the 0° line of longitude. Reefs pertain to underwater structures often formed by coral, rivers are natural bodies of flowing water, and time zones are divisions of the Earth used to standardize time based on longitudinal divisions. However, none of these terms specifically denote the imaginary line that serves as the baseline for longitude.