Question: what is the most abundant source of fresh water on earth
[{'answer': 'precipitation', 'provenance': [{'wikipedia_id': '230001', 'title': 'Fresh water', 'start_paragraph_id': 12, 'start_character': 40, 'end_paragraph_id': 12, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Sources.\n'}]}, {'provenance': [{'wikipedia_id': '230001', 'title': 'Fresh water', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 580, 'bleu_score': 0.9792717993254391, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12836746799283636102}, 'section': 'Section::::Sources.\n'}]}]