The Prime Meridian extends from the North Pole, through the city of Grenwich in the UK to the South Pole. It intersects the following African countries:
western, its just barely on the left side of the prime meridean
The five African countries along the prime meridian are Algeria, Mali, Burkina Faso, Togo, and Ghana.
Vertical
Yes it does.
"240 degrees east of the Prime Meridian" places you at 120 degrees west longitude.
-- Algeria -- Mali -- Burkina Faso -- Togo -- Ghana
prime meridean
The Continent's it passes are Africa, Antarctica, and Europe
Three: Europe, Africa,and Antarctica.
It's a meridian, directly opposite the Prime Meridian.
AlgeriaMaliBurkina FasoTogoGhana
At zero degrees longitude. Only on one side, the other side is the international date line.