Question: smooth glassy rock that forms when lava cools
[{'answer': 'Volcanic rocks', 'provenance': [{'wikipedia_id': '316414', 'title': 'Volcanic rock', 'start_paragraph_id': 1, 'start_character': 644, 'end_paragraph_id': 1, 'end_character': 658, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '316414', 'title': 'Volcanic rock', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 335, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 566265912344833905}, 'section': 'Section::::Characteristics.:Texture.\n'}]}]