Question: what type of soil is found in deccan plateau region
[{'answer': 'rich volcanic soils', 'provenance': [{'wikipedia_id': '459370', 'title': 'Deccan Plateau', 'start_paragraph_id': 20, 'start_character': 209, 'end_paragraph_id': 20, 'end_character': 228, 'bleu_score': 1.0, 'section': 'Section::::Geography.:Climate.\n'}]}]