21. Mars

21. Mars

Courtesy of NASA/JPL/Malin Space Science Systems

http://www.msss.com/mars_images/moc/2005/09/20/eberswalde/


This image shows a fossil delta in Eberswalde Crater on Mars. The delta shows the first clear evidence that liquid water flowed on the sure of Mars. Unlike the recent changes observed, this delta is old. The sediments were deposited in water, but were covered by more sediments and turned to rock. Erosional forces, such as wind, have exposed this ancient delta.