Question: what is the outer core of earth made up of
[{'answer': 'iron', 'provenance': [{'wikipedia_id': '146249', 'title': "Earth's outer core", 'start_paragraph_id': 1, 'start_character': 71, 'end_paragraph_id': 1, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'nickel', 'provenance': [{'wikipedia_id': '146249', 'title': "Earth's outer core", 'start_paragraph_id': 1, 'start_character': 80, 'end_paragraph_id': 1, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '146249', 'title': "Earth's outer core", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 366, 'bleu_score': 0.596083952620543, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17581896527247830331}, 'section': 'Section::::Abstract.'}]}]