What is the difference between the front, back, dorsal and ventral sides of an earthworm?

There is a mouth on the front of the earthworm. Through it, the worm feeds on the decayed parts of plants, which it swallows along with the soil. At the back of the worm is the anus, through which waste and excess soil are removed. The belly side of earthworms is flat and light, and the dorsal side is convex and dark, reminiscent of soil in color, which helps camouflage.