Question: what are the main areas of earth science
[{'answer': 'Physical geography', 'provenance': [{'wikipedia_id': '20653168', 'title': 'Earth science', 'start_paragraph_id': 6, 'start_character': 12, 'end_paragraph_id': 6, 'end_character': 30, 'bleu_score': 1.0, 'section': 'Section::::Fields of study.\n'}]}, {'answer': 'Geology', 'provenance': [{'wikipedia_id': '20653168', 'title': 'Earth science', 'start_paragraph_id': 3, 'start_character': 44, 'end_paragraph_id': 3, 'end_character': 51, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Geophysics', 'provenance': [{'wikipedia_id': '20653168', 'title': 'Earth science', 'start_paragraph_id': 8, 'start_character': 444, 'end_paragraph_id': 8, 'end_character': 454, 'bleu_score': 1.0, 'section': 'Section::::Fields of study.\n'}]}, {'answer': 'Soil science', 'provenance': [{'wikipedia_id': '20653168', 'title': 'Earth science', 'start_paragraph_id': 9, 'start_character': 12, 'end_paragraph_id': 9, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::Fields of study.\n'}]}, {'answer': 'Ecology', 'provenance': [{'wikipedia_id': '20653168', 'title': 'Earth science', 'start_paragraph_id': 10, 'start_character': 12, 'end_paragraph_id': 10, 'end_character': 19, 'bleu_score': 1.0, 'section': 'Section::::Fields of study.\n'}]}, {'answer': 'Hydrology', 'provenance': [{'wikipedia_id': '20653168', 'title': 'Earth science', 'start_paragraph_id': 6, 'start_character': 76, 'end_paragraph_id': 6, 'end_character': 85, 'bleu_score': 1.0, 'section': 'Section::::Fields of study.\n'}]}, {'answer': 'Glaciology', 'provenance': [{'wikipedia_id': '20653168', 'title': 'Earth science', 'start_paragraph_id': 12, 'start_character': 12, 'end_paragraph_id': 12, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Fields of study.\n'}]}, {'answer': 'Atmospheric sciences', 'provenance': [{'wikipedia_id': '20653168', 'title': 'Earth science', 'start_paragraph_id': 13, 'start_character': 12, 'end_paragraph_id': 13, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Fields of study.\n'}]}]