Question: how did the u.s. rocky mountains come to look the way they do today
[{'answer': 'erosion by glaciers', 'provenance': [{'wikipedia_id': '8373916', 'title': 'Geology of the Rocky Mountains', 'start_paragraph_id': 3, 'start_character': 311, 'end_paragraph_id': 3, 'end_character': 330, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8373916', 'title': 'Geology of the Rocky Mountains', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 376, 'bleu_score': 0.9114434865990401, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3694104738572515693}, 'section': 'Section::::Abstract.'}]}]