he sand-covered surface to the inner workings of this planet or to the history beneath the sands. The evidence shows that the surface of Mars is different from any sand dunes on Earth. This is a planet made almost entirely of deserts. This is really a world covered by dust rather than true sand, and it is also a planet whose surface has been moved around by winds. The air is very thin, and the wind that moves the sand is blowing ten times harder than it would on Earth. The picture that is emerging is also one with a number of mysteries. Scientists can study where the sand comes from, but they are also puzzled by the scarcity of dunes. There are major areas of dunes and dune fields, and these dunes are different than those on Earth. For one thing, they are dark,
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