question: At what dimensions are glaciers called ice sheets or continental glaciers ?
answer: 50,000 km2 ( 19,000 sq mi )
turker_answer: glaciers called ice sheets or continental glaciers at dimensions of 50,000 km2 ( 19,000 sq mi ) .
rule-based: Glaciers are called ice sheets or continental glaciers at 50,000 km2 ( 19,000 sq mi ) .