Question: what is the difference between combustion and explosion
[{'answer': 'The speed of the reaction', 'provenance': [{'wikipedia_id': '18993857', 'title': 'Explosion', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Properties of explosions.:Velocity.\n'}]}, {'provenance': [{'wikipedia_id': '18993857', 'title': 'Explosion', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 721, 'bleu_score': 0.983401048538667, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11654484066677299633}, 'section': 'Section::::Properties of explosions.:Velocity.\n'}]}]