Water is said to have carved many of the features on Mars.

Scientists from the University of California reported in June 2007 that a “confirmation” for the Martian liquid ocean theory was found: “shorelines” extending for thousands of kilometers around a large lake that existed a little over three billion years ago. It is speculated that the “liquid oceans” have been gone for over two billion years...................

...............The fact that areologists are thinking about lava instead of water is a step toward an understanding of catastrophic evolution on Mars. If what we find on Mars took place in the presence of planetary lightning bolts and was not the result of ice or water moving across the surface, should we rethink our ideas about similar observations here on Earth?