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