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Which line defines 0 degrees longitude?

AThe Equator
BThe Date Line
CTropic of Cancer
DPrime meridian
Answer & Solution
Correct answer: D. Prime meridian
1. Longitude needs a reference line. 2. The prime meridian defines 0 degrees longitude. 3. The Equator is 0 degrees of latitude, not longitude. _Source: Wikipedia, Longitude, Lead section_
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