Which ocean does the prime meridian divide into two equal parts?
arctic
atlantic
indian
pacific

The Prime Meridian divides the Arctic Ocean into two equal halves.

Explanation:

The Arctic Ocean lies around the Arctic circle and thus, the name. The reason the Prime Meridian divides the Arctic Ocean into two equal parts is that the Arctic Ocean has a ring-like orientation that encompasses the Arctic circle. The Prime Meridian runs in a circle around the Earth to divide it in the eastern and the western hemisphere.