Scope Notes: As of 1993, term may be used for caps on Earth or on other bodies. From 1989-1992, it was restricted to polar caps of extraterrestrial bodies; North Pole, South Pole, Polar regions or Antarctic Polar Cap was used for the Earth. For Mars before 1993, also search Polar Cap AND Mars. Before 1981, Polar Cap included use for the ice cap centered at the Earth's South Pole and was indexed with Antarctica. Now use Antarctic Polar Cap for this. Added to Thesaurus in 1989.
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