Which imaginary line divides the Earth into eastern and western hemispheres at 0 degrees longitude?

• A. Hemisphere
• B. Prime Meridian
• C. Latitude
• D. Cartographer

Answer: (B)

The key idea is that a reference line of longitude divides the globe into eastern and western halves. The line at 0° longitude runs from the North Pole to the South Pole and is called the Prime Meridian. It establishes where measuring longitude starts, with positions east or west of it. This line is imaginary, not a physical boundary, but it’s the standard by which we separate the eastern and western hemispheres.

For context: longitude lines run from pole to pole and are used to measure how far east or west you are from the Prime Meridian. The opposite side of the globe is near 180° longitude. Other terms here aren’t about lines that split the globe; a hemisphere is a half of the earth, latitude lines run parallel to the equator and separate northern and southern halves, and a cartographer is a mapmaker.