Hints： channel Mars colossal --Jim Rice

Only a river would leave a meandering trace like this. Only a river would leave the traces of silt they saw in the bend, and only water could carve the winding channel feeding into it. But they soon found more than just a few rivers. They discovered evidence that water had once existed on Mars in colossal quantities. The evidence came from another probe that reached Mars in 1997. It landed in an enormous channel and sent back images of huge boulders scattered around the Martian surface. Scientists were puzzled. What could this strange pattern signify? One man looking on knew exactly what those scattered stones meant--Jim Rice.

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