Was there only one river millions of years ago? It seems they'd have dug a canyon just as impressive, if not more impressive, than the Grand Canyon.
God must have been REALLY annoyed with the Martians then. He flooded Mars with a much bigger flood - it carved the
Valles Marineris.
quote:
A "Grand Canyon of Mars" slices across the Red Planet near its equator. This canyon -- Valles Marineris, or the Mariner Valley -- is 10 times longer and deeper than Arizona's Grand Canyon, and 20 times wider. As the picture shows, you could drop the whole Los Angeles basin into a small part of Valles Marineris and leave plenty of room to spare. In length, the canyon extends far enough that it could reach across the United States from East Coast to West Coast, while its rim stands more than 25,000 feet high, nearly as tall as Earth's Mount Everest.
A massive flood in the last 6000 years or so on Mars? How exciting
Anyway - I can't help but feel the thread is in danger of slipping of topic slightly. It might be a good idea to review the OP to check if we haven't drifted at all.
Edited by Modulous, : No reason given.