Hello! Your image isn't quite showing up, so this answer could be either the International Date Line, or the Prime Meridian. I'll edit this post as soon as I'm able to see the image. Where is the line located relative to the picture? Is it in the middle going down vertically? Or is it at the edge of the map.
A fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement as a result of rock-mass movement.
