Mars 4

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reigons. The mineral scapolite,which is rare on Earth,seem's wide spread; it may serve as a store for carbon dioxide in the atmosphere.
Bright caps, apparntly made of frost or ice, mark the planet's polar regions . their seasonal cycle has been followed for almost two centuries .Each Martian autumn, bright clouds form over correct pole.Bellow what is called polar hood , a thin cap of carbon dioxide frost is let during autumn and winter.By late winter, the cap may streach down to latitudes of 45 degrees. At about spring, and the end of the long polar night, the polar hood diseapers, showing the winter frost cap; then gradually decreases poleward as sunlight evaporates the gatherd frost. By mid summer the steady recessions of the annual cap stops and lasts till next autumn. These remnant polar caps are believed to consist almost all frozen water.They are 185 miles wide at the south pole and 620 miles wide in the north. Although their real thickness is not known, they must have frozen ...

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