Question: approximately what percentage of earth’s surface is covered with water
[{'answer': '71 %', 'provenance': [{'wikipedia_id': '33306', 'title': 'Water', 'start_paragraph_id': 167, 'start_character': 199, 'end_paragraph_id': 167, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Law, politics, and crisis.\n'}]}]