Answer: polarcap

AnswerCrossword Clue
POLARCAPTopmost region?
POLARCAPHigh-latitude formation
POLARCAPIcy formation at either extremity of the Earth's axis
POLARCAPHead of the world?
POLARCAPPlanet's icy area
POLARCAPIcy area to the north or south
POLARCAPSource of some icebergs
POLARCAPInuit headgear
POLARCAPMartian feature
POLARCAPIce mass way up north