Question: what are the main components of earth's atmosphere
[{'answer': 'nitrogen', 'provenance': [{'wikipedia_id': '202898', 'title': 'Atmosphere of Earth', 'start_paragraph_id': 2, 'start_character': 35, 'end_paragraph_id': 2, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'oxygen', 'provenance': [{'wikipedia_id': '202898', 'title': 'Atmosphere of Earth', 'start_paragraph_id': 2, 'start_character': 52, 'end_paragraph_id': 2, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'argon', 'provenance': [{'wikipedia_id': '202898', 'title': 'Atmosphere of Earth', 'start_paragraph_id': 2, 'start_character': 66, 'end_paragraph_id': 2, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '202898', 'title': 'Atmosphere of Earth', 'start_paragraph_id': 7, 'start_character': 29, 'end_paragraph_id': 7, 'end_character': 1328, 'bleu_score': 0.9191649021698681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9994257804846032508}, 'section': 'Section::::Composition.\n'}]}]