Sure looks like water was involved, doesn't it?

Sure looks like water was involved, doesn't it?  Curiosity, the Mars rover, is looking at those rocks at right.  Meanwhile, as I'm sure you've heard, NASA announced confirmation of present-day flows of liquid water on Mars.  This is a necessary prerequisite for life-as-we-know it.  There are organisms on Earth that most likely could live on Mars, in or near those water flows...