Young Earth Creationists: Why did God create geological formations on mars that suggest ancient rivers?

There are dried up valleys, canyons, rivers, deltas, and shorelines on Mars that suggest massive erosion some time in the past. Was there a great flood on Mars too? a href="http://www.youtube.com/watch?v=XsGsQZxtQ38" rel="nofollow"http://www.youtube.com/watch?v=XsGsQZxtQ…/a