question: What produces brake dust?
choices.text: Filling a tire with air uncontrollable burning mild heating process A rubber tire microscopic organisms collision of crustal plates A parked car Stopping a vehicle
choices.label: A B C D E F G H
fact2: Brake dust is produced during the friction of braking.
combinedfact: Stopping a vehicle produces brake dust.
formatted_question: What produces brake dust? (A) Filling a tire with air (B) uncontrollable burning (C) mild heating process (D) A rubber tire (E) microscopic organisms (F) collision of crustal plates (G) A parked car (H) Stopping a vehicle