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Directory Of Year 1983, Issue 4
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Current Location:English » 19834 » Reading the Secrets of the Earth
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Reading the Secrets of the Earth

Year:1983 Issue:4

Column: Science

Author: YOU YUZHU and ZHENG HONGHAN

Release Date:1983-04-01

Page: 60-62

Full Text:  

THE EARTH is 4.6 billion years old, and about 2.5 million years ago it entered a new stage, the Quaternary. This period has been marked by great ice ages alternating with warmer inter-glacial epochs...

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