• question_answer Prime Meridian passes through which of the following countries? A)  France, Spain, Algeria and Mali B)  U.K., Morocco, Niger and Nigeria C)  Cameroon, Gabon, Congo and Angola D)  Namibia, Portugal, Denmark and Belgium

[a] A prime meridian is a meridian (a line of longitude) in a geographical coordinate system at which longitude is defined to be$0{}^\circ$. Together, a prime meridian and its antimeridian (the 180th meridian in a $360{}^\circ$-system) form a great circle. This great circle divides the sphere, e.g. the Earth, into two hemispheres.