The next obstacle comes in the form of what resembles a rough, dry river bed. (bestride.com)
However, evidence exists from the rocks studied by NASA's rovers, including the Mars Curiosity Rover, as well as images of dry river beds made by orbiting observatories such as NASA's Mars Reconnaissance Orbiter, that the Martian atmosphere 3.5 billion years ago was denser and warmer due the Greenhouse effect and supported the presence of liquid water at the surface. (sciencetrends.com)
Wadi Rum Jeep Safari & Camel Trek A drive south along the Desert Highway brings us to the northern reaches of Wadi Rum, where we walk through the twisting siqs (gorges) and wadis (dry river valley... (wanderlust.co.uk)