Question: what is the name for water that accumulates underground
[{'answer': 'An aquifer', 'provenance': [{'wikipedia_id': '47481', 'title': 'Aquifer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '47481', 'title': 'Aquifer', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 567, 'bleu_score': 0.977397480575333, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10444034996286449582}, 'section': 'Section::::Abstract.'}]}]