Anna raised her hand, confident that she knew the answer to this question, as well. "Aristotle was forced to take the position that strong winds had lifted an Earth rock into the sky, then dropped it. The alternate theory held that meteorites somehow formed in the sky during violent thunderstorms. Proponents of this idea suggested that particles inside the clouds consolidated because of the heat during a lighting flash. That's where we get the term 'thunderstone,'" she said.