Question: huge pieces of ice floating in the sea are called
[{'answer': 'iceberg', 'provenance': [{'wikipedia_id': '146230', 'title': 'Iceberg', 'start_paragraph_id': 1, 'start_character': 3, 'end_paragraph_id': 1, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]