Question: what happens when iron reacts with oxygen and water
[{'answer': 'Rust', 'provenance': [{'wikipedia_id': '26477', 'title': 'Rust', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 4, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26477', 'title': 'Rust', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 332, 'bleu_score': 0.7308895121248471, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11309036577591789680}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '26477', 'title': 'Rust', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 502, 'bleu_score': 0.7022463809881141, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11309036577591789680}, 'section': 'Section::::Chemical reactions.\n'}]}, {'provenance': [{'wikipedia_id': '24431820', 'title': 'Anti-corrosion', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['When metallic materials are put into corrosive environments, they tend to have chemical reactions with the air and/or water.', 'rusting', 'For example, after putting a piece of iron into a corrosive atmosphere for an extended period, it starts rusting due to oxygen interaction with water on the surface of the piece of iron.']}}]}, {'provenance': [{'wikipedia_id': '155443', 'title': 'Corrosion', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['Corrosion is a natural process that converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide. It is the gradual destruction of materials (usually metals) by chemical and/or electrochemical reaction with their environment', 'Rusting', 'It is the gradual destruction of materials (usually metals) by chemical and/or electrochemical reaction with their environment. Corrosion engineering is the field dedicated to controlling and stopping corrosion. In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen or sulfates.']}}]}]