Question # 6
Over the southern ural region of russia, a fireball hit the atmosphere at a speed of at least 54,000 km/h (33,000mph),roughly 44 times the speed of sound , and shattered over the city of chelyabinsk, a large fragment seem to have hit lake chebarkul . the russian academy of sciences estimated that the meteor, called KEF-2013, had a mass of 10 tons and the air burst occurred at an altitude between 30-50 km (19-31mi) above the ground on: