It is a parallel. It is parallel to the equator.
The Prime Meridian crosses the Tropic of Cancer in southwestern Algeria about 150 miles east of Mali in Africa.
parallel
Africa
It is not. it is horizontal along with the Tropic of Cancer and the Tropic of Capricorn.
Africa.
Africa, along with the Tropic of Capricorn and the Prime Meridian.
Africa
Africa
Parallel of latitude, as is the Tropic of Cancer and the Equator Meridians of longitude run north-south, like the IDL or Greenwich Meridian
The Prime Meridian, which is why it is known as the Greenwich Meridian.
Africa.
Each of those lines crosses some part of Africa.