What Makes River Rock Round?
Published: Monday, 17 March 2014 15:44
For centuries, geologists have recognized that the rocks that line riverbeds tend to be smaller and rounder further downstream. But these experts have not agreed on the reason these patterns exist. Abrasion causes rocks to grind down and become rounder as they are transported down the river. Does this grinding reduce the size of rocks significantly, or is it that smaller rocks are simply more easily transported downstream?
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Where Did That Rock Come From?
Published: Friday, 14 February 2014 11:22
According to space.com, after a decade of exploring the Martian surface, the scientists overseeing the rover Opportunity thought they’d seen it all. That was until a rock mysteriously appeared a few feet in front of the six-wheeled rover.
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