Question: what type of soil is found in deccan plateau
[{'answer': 'volcanic', 'provenance': [{'wikipedia_id': '459370', 'title': 'Deccan Plateau', 'start_paragraph_id': 20, 'start_character': 214, 'end_paragraph_id': 20, 'end_character': 222, 'bleu_score': 1.0, 'section': 'Section::::Geography.:Climate.\n'}]}]