Question: where does the material that forms beaches come from
[{'answer': 'rock', 'provenance': [{'wikipedia_id': '40630', 'title': 'Beach', 'start_paragraph_id': 1, 'start_character': 139, 'end_paragraph_id': 1, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'sand', 'provenance': [{'wikipedia_id': '40630', 'title': 'Beach', 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 157, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'gravel', 'provenance': [{'wikipedia_id': '40630', 'title': 'Beach', 'start_paragraph_id': 1, 'start_character': 159, 'end_paragraph_id': 1, 'end_character': 165, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'shingle', 'provenance': [{'wikipedia_id': '40630', 'title': 'Beach', 'start_paragraph_id': 1, 'start_character': 167, 'end_paragraph_id': 1, 'end_character': 174, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'pebbles', 'provenance': [{'wikipedia_id': '40630', 'title': 'Beach', 'start_paragraph_id': 1, 'start_character': 176, 'end_paragraph_id': 1, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'cobblestones'}, {'answer': 'mollusc shells', 'provenance': [{'wikipedia_id': '40630', 'title': 'Beach', 'start_paragraph_id': 1, 'start_character': 241, 'end_paragraph_id': 1, 'end_character': 255, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'coralline algae', 'provenance': [{'wikipedia_id': '40630', 'title': 'Beach', 'start_paragraph_id': 1, 'start_character': 259, 'end_paragraph_id': 1, 'end_character': 274, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '40630', 'title': 'Beach', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 274, 'bleu_score': 0.885632718431904, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1166737228548161985}, 'section': 'Section::::Abstract.'}]}]