Although no one is sure about where these dark streaks came from, there are a few accepted theories. Many believe that they are caused by sand particles traveling down the sides of a big trough on Mars. It has been shown that the most recent lines are the darkest, and they sometimes travel right over the older, lighter ones. In addition to other environmental occurrences, this may lead to rapid changes in Mars' surface. No one has been able to figure out what lightens the streaks over time. The picture was taken from the Mars Reconnaissance Orbiter. The sand also appears so move like a fluid around big objects, such as boulders.
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