GSFC: LAVA LIKELY MADE RIVER-LIKE CHANNEL ON MARS
Posted: Fri Mar 05, 2010 1:19 pm
http://www.nasa.gov/topics/solarsystem/ ... nnels.html
Flowing lava can carve or build paths very much like the riverbeds and canyons etched by water, and this probably explains at least one of the meandering channels on the surface of Mars.