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a176
Canada6688 Posts
![[image loading]](http://apod.nasa.gov/apod/image/1306/lineargullies_hirise_960.jpg) So there are these gullies on mars. Obviously they are not formed by liquid water. And the structures probably aren't created by wind. Hypothesis: they are formed by 'dry ice' blocks tumbling down the side of sand dunes. Dry ice is pretty common on mars. But how do you prove it? Send NASA scientists out to the desert for some fun experiments! (note that the dry ice "blocks" on mars are probably more boulder sized)   | ||
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Emzeeshady
Canada4203 Posts
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garbanzo
United States4046 Posts
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