Content excerpt:

1. Time has no feet, but people have come up with many ways to record its traces, using clocks and calendars ... but when there is no one on the earth, or when people don't know how to record time, where can they find the traces of time?

2. However, the time was recorded. There are many kinds of time records in nature, and the rocks lying in Shan Ye are one of them. Each centimeter of rock represents decades to hundreds of years.

3. In the Forbidden City in Beijing, we can also see an ancient timing device: copper pot dripping-water drips slowly from one copper pot to another. Time passed, and the water in this pot was empty, but the water in that pot increased. Time is invisible, but we use water droplets to record the elapsed time. How do stones record time?

Author Tao Shilong:

1, Tao Shilong (65438+April -0929), a native of Anyue County, Sichuan Province.

2. 1948 studied in the Geology Department of Peking University. 195 1 year worked in Beijing Youth League Committee. 65438-0952, participated in the establishment of Beijing Institute of Geology, and served as director, deputy director, deputy editor-in-chief, editor-in-chief of this journal, director of geological history research office and librarian.

From 65438 to 0949, he began to write articles to popularize the knowledge of geology and mineral resources. Later, hundreds of popular science essays and other popular science works were published one after another, including Uncovering the Secret of the Earth, Portrait of the Earth and Footprints of Time. He was rated as a popular science writer with outstanding achievements by China Popular Science Writers Association.