Explosive volcanic eruptions are cool, really, cool. They inject ash into the stratosphere and deflect the sun's rays. When eighth grader Jamie Fulton learns that snow fell in June in his hometown because of an eruption on the other side of the world, he's psyched! He could have snowboarded if he'd lived back in 1815 during the year without a summer. Clara Montalvo, who recently arrived at Jamie's school after surviving Hurricane Maria in Puerto...