| 11. | Somebody check to see if the polar caps have melted.
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| 12. | However, Mars does have polar caps of frozen carbon dioxide.
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| 13. | The mission has also given scientists some understanding of how the polar caps retreat.
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| 14. | The GEOSAR satellites do not cover the polar caps.
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| 15. | Its polar caps wax and wane over the decades.
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| 16. | In each hemisphere's autumn and winter, the gas condenses to ice deposited over the polar caps.
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| 17. | Crustal movements ( such as continental drift ) or polar cap melting are slow secular events.
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| 18. | These scalloped features are superficially similar to Swiss cheese features, found around the south polar cap.
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| 19. | As ice, it can remain locked in the polar caps for tens of thousands of years.
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| 20. | It is thought that the surface of Triton probably consists of a south polar cap each spring.
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