Question: in a cross-section of a glacier the greatest flow velocities (speeds) occur
[{'answer': 'at the surface', 'provenance': [{'wikipedia_id': '17288465', 'title': 'Ice-sheet dynamics', 'start_paragraph_id': 20, 'start_character': 281, 'end_paragraph_id': 20, 'end_character': 295, 'bleu_score': 1.0, 'section': 'Section::::Glaciers.:Flow dynamics.\n'}]}, {'provenance': [{'wikipedia_id': '17288465', 'title': 'Ice-sheet dynamics', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 359, 'bleu_score': 0.9657992495762461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5722610057277410497}, 'section': 'Section::::Glaciers.:Flow dynamics.\n'}]}]