BBC News has an article stating that scientists now have definitive proof that many of the landscapes seen on Mars were indeed cut by flowing water.
Researchers have found rounded pebbles in the Gale Crater on Mars.
“Big deal they found rounded rocks!” you might be saying. Well these pebbles’ smooth appearance is identical to pebbles found in rivers here on Earth. Now when rock fragments roll on the bottom of of a stream of water will have their edges knocked off, thus rounding them. Eventually they will come to a rest in a characteristic overlapping pattern.
The Curiosity rover has photographic proof of rocks with these exact characteristics; thus proving that flowing water had a part in shaping the martian landscape.
Check the full article here.