学历史的时候,大家一定都背诵过中国历史朝代表,知道唐、宋、元、明、清的朝代顺序。整个地球的历史也有朝代,地球的“历史朝代表”被称为地质年代表,地质学家根据地球上生物的盛衰更替,建立了不同的“纪”,来表示地球历史的不同时期。比如我们现在所处的时期是第四纪,恐龙绝灭 When we learn history, we must all recite the representative of the Chinese history and know the order of the dynasties of the Tang, Song, Yuan, Ming and Qing dynasties. The history of the entire earth has also dynasties. The Earth’s “historical dynasty representatives” is called the geochronology. Geologists have established different “discipline” according to the ups and downs of life on Earth to represent different periods of earth’s history. For example, we are now in the Quaternary period, the dinosaurs extinction