Question: which type of soil is formed by leaching process
[{'answer': 'Laterite', 'provenance': [{'wikipedia_id': '16921463', 'title': 'Leaching (pedology)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 8, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '16921463', 'title': 'Leaching (pedology)', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 122, 'bleu_score': 0.9021315316859231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14880129579191595715}, 'section': 'Section::::Abstract.'}]}]