Question: what is a continuous series of underwater mountains called
[{'answer': 'Ocean Ridges', 'provenance': [{'wikipedia_id': '19338', 'title': 'Mountain range', 'start_paragraph_id': 6, 'start_character': 294, 'end_paragraph_id': 6, 'end_character': 306, 'bleu_score': 1.0, 'section': 'Section::::Major ranges.\n'}]}, {'provenance': [{'wikipedia_id': '19338', 'title': 'Mountain range', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 377, 'bleu_score': 0.8821387334903261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16472275152903568782}, 'section': 'Section::::Major ranges.\n'}]}]