Topics in the 26 March posting of GEOLOGY include anthropogenic impacts on the Indus River into the Arabian Sea; possible electrical conductivity beneath the Yellowstone hotspot track; mountain-forming volcanoes and deadly debris flows; melting beneath the Colorado Plateau; widespread weathered glass on Mars; and a new view into Mars' global aqueous history.

A camera aboard NASA's Mars Odyssey spacecraft has helped develop the most accurate global Martian map ever.

The Mars Express High Resolution Stereo Camera imaged a region close to Ma’adim Vallis, one of the largest canyons on Mars, finding craters, lava flows and tectonic features.

Data and images from Mars Express suggest that several Light Toned Deposits, some of the least understood features on Mars, were formed when large amounts of groundwater burst on to the surface.

The U.S. space agency says its Mars Reconnaissance Orbiter has found evidence that liquid water remained on Mars far longer than previously theorized. The National Aeronautics and Space Administration spacecraft has observed hydrated silica, or opal, spread across large regions of Mars.