Did Water Once Flow on the Surface of Mars ?
Viewpoint: Yes, evidence from various Mars missions indicates that water once flowed on Mars and helped shape the current landscape.
Viewpoint: No, the topographical features suggesting that water once flowed on Mars lack crucial elements necessary to support the theory that water flowed on Mars.
People have wondered about the planet Mars for hundreds of years. Mars is Earth's closest neighbor in the solar system, and it is close to Earth in size and appearance as well. While Mars presents no obvious bodies of water, polar ice caps on the planet grow and shrink with the seasons. Yet more intriguing to observers are the mysterious channels visible on the Martian surface. The appearance of these channels have led to speculations about the presence of water on Mars. While modern telescopes and exploratory missions have shown conclusively that there is no water flowing on the Martian surface today, speculation about a watery past on Mars has continued.
Mars presents a range of geological features and formations that could have been formed by water and accompanying erosion. Valleys, gullies, riverbeds, and flood plains appear in images of the Martian landscape. But is a Martian "riverbed" really the same geological feature recognized on Earth, or is it just a superficial resemblance? Critics of the claim that Mars once contained large quantities of water argue that it is much more likely that forces of wind and volcanism, rather than water, shaped the surface of Mars.
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