火山で有名なシチリア島のエトナ山の話。地理・地学好きには楽しい本。 Caffo says ''Without the volcano,there isn't...life.'' 【興味深い一文】It reminds him of the fact that he is very small when he compares himself with the size of the earth！ 【興味深い単語】thermodynamics:connect to the relationship between heat and other types of energy