Volcanic Vent, East of Pavonis Mons (Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit)

This image shows an Equatorial Volcanic Vent. A Volcanic Vent is an opening in the Crust of a Planet that emits Lava (such as "molten rock") and Volcanic Gases. The rough texture of the Plains surrounding the Vent is indicative of Lava.

There is a large number of snake-like features emanating from the Vent. The parallel lines that outline the features are "Levees", which mark the edges of Channels that carried molten Lava. As Lava flows, it moves slowest at its edges and bottom because the Lava sticks to the non-flowing rocks; as a consequence of this event, the lava slows down, cools off and, in the end, it hardens.

Levees, on their side, form when the sides of the Lava Flow harden but the center of it keeps moving. As the eruption episode ends, and the Lava drains, the center is left lower than the sides producing these high-standing structures.