Evidence for an Ancient Ocean on Mars

Evidence for an Ancient Ocean on Mars

The southern hemisphere of Mars is a jagged, pummeled, and scarred terrain. Deep chasms gorge the crust, craters of all sizes pockmark the surface, towers of rock split the horizon where volcanoes lie dormant, and enormous channels cut across hundreds of miles of rocky terrain.

After billions of years of meteor impacts, volcanic eruptions, and flash floods, the surface of Mars's southern hemisphere is a testament to its violent history, and looks exactly as a planet with that history would be expected to look.