Cover with ice or snow or a glacier.

Roget 385: cool, fan, refrigerate, refresh, ice; congeal, freeze, glaciate; benumb, starve, pinch, chill, petrify, chill to the marrow, regelate^†, nip, cut, pierce, bite, make one's teeth chatter, damp, slack quench; put out, stamp out; extinguish; go out, burn out (incombustibility) 388.1. ... meer laten zien

Become frozen and covered with glaciers.