Question: what does sandstone turn into under heat and pressure
[{'answer': 'quartzite', 'provenance': [{'wikipedia_id': '27772', 'title': 'Sandstone', 'start_paragraph_id': 4, 'start_character': 45, 'end_paragraph_id': 4, 'end_character': 54, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27772', 'title': 'Sandstone', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 138, 'bleu_score': 0.7483293841345241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12003318213949636025}, 'section': 'Section::::Abstract.'}]}]