Terms for subject Makarov containing vertical cylindrical opening, 1-2 m in diameter, on a glacier tongue, formed by melt water plunging

English	Russian
vertical cylindrical opening, 1-2 m in diameter, on a glacier tongue, formed by melt water plunging down into a crevasse and destroying ice	вертикальное цилиндрическое отверстие диаметром 1-2 м на языке ледника, образованное в трещине путём разрушения льда талыми водами