Question: where does the water in niagra falls come from
[{'answer': 'Great Lakes', 'provenance': [{'wikipedia_id': '52028', 'title': 'Niagara Falls', 'start_paragraph_id': 3, 'start_character': 302, 'end_paragraph_id': 3, 'end_character': 313, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '52028', 'title': 'Niagara Falls', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 389, 'bleu_score': 0.824366412600761, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2794950838422236068}, 'section': 'Section::::Abstract.'}]}]