Question

what is the prime meridian?
an imaginary line of latitude that circles earth horizontally
an imaginary line that runs from the north pole to the south pole, passing through greenwich, england
intersecting lines of latitude and longitude
lines that cross earth diagonally from side to side

Explanation:

The Prime Meridian is an imaginary line of longitude (not latitude). It runs from the North Pole to the South Pole. It is defined as passing through the Royal Observatory in Greenwich, England. Latitude lines circle the Earth horizontally (so the first option is wrong). Intersecting lines of latitude and longitude are just grid - like intersections (third option is wrong). Lines crossing diagonally (fourth option) is not a correct description of the Prime Meridian.

Answer:

An imaginary line that runs from the North Pole to the South Pole, passing through Greenwich, England.