The Forbidden Flats (Sky Jumpers, #2) by Peggy Eddleman
More action and adventure and some chemistry and geology fill this second book in the series. Once again, it is up to 12 year old Hope and her friends to brave the Bomb's Breath to save their town. When an earthquake releases gasses into the atmosphere, the deadly Bomb's Breath begins to lower over their town of White Rock and if they can't get a cure and bring it back in time, the town will become uninhabitable. Awesome story!