Question: hydrosphere covers how much of earth's lithosphere
[{'answer': '71 %', 'provenance': [{'wikipedia_id': '145753', 'title': 'Hydrosphere', 'start_paragraph_id': 3, 'start_character': 298, 'end_paragraph_id': 3, 'end_character': 304, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'an area of some 361 million square kilometers ( 139.5 million square miles )'}]