This MOC image shows narrow channel on the upper east flank of the martian volcano, Hadriaca Patera. Located on a volcano, most likely this channel was formed by lava, perhaps as a lava tube at which the thin roof later collapsed
This MOC image shows narrow channel on the upper east flank of the martian volcano, Hadriaca Patera. Located on a volcano, most likely this channel was formed by lava, perhaps as a lava tube at which the thin roof later collapsed