Nothing at all.
The Prime Meridian and the equator cross this continent - Africa (Correct me if i am wrong please!)
Africa
Africa
Africa
equator prime meridian
Africa
-- Gulf of Guinea, south of Accra, Ghana -- Since everywhere on the equator is zero latitude, and everywhere on the Prime Meridian is zero longitude, the point that is common to both had better have the coordinates zero/zero .
countries in Europe and Africa that greenwich meridian crosses
Many countries do not cross the equator.
The Prime Meridian and the Equator intersect in the sea off the west African coast. So the continent is Africa and, according to Google, it is off the Ivory Coast/Gabon.
None
Lines of equal Latitude run parallel (ie never cross) East-West (such as the Equator) Lines of equal Longitude (Meridian) run North-South and cross at the Poles.