Heh, guess we were right after all; i was part of a high school research team to count the number of craters of mars, and we found at low elevations there were less small craters than at high elevations. So we made the supposition that erosion by water erased them, like what happens here on Earth.

Water in the form of ice has been found on a crater on Mars using a European space agency probe and a high-resolution camera. In recent decades a mountain (or glacier) of evidence has put forth the idea that Mars does indeed have water, and at one point, billions of years ago, it was warmer, and had liquid water, lots of it.

Planetary studies are very slow because of the few missions, but it reminds me alot of how science really works, first an idea, then a test, then more and more and more, until the idea is a theory, and more or less accepted by the scientific community. There can be no doubt now that there is definately water on Mars, but how did Mars become etched with flood-like patterns is not known, although the most obvious explaination is that billions of years ago, it was warmer.