Answer:
The Prime Meridian goes from the North Pole to The South Pole, it's an imaginary great circle on Earth's surface, it measures 20000 km.
Explanation:
The African countries west West of the Prime Meridian are: Algeria, Morocco, Western Sahara, Mauritania, Senegal, The Gambia, Guinea-Bissau, Guinea, Sierra Leone, Liberia, Cóte Dívoire, Ghana, Burkina Faso, and Mali.