The earth has experienced 25 great milestones which serve as important turning points in the shaping of the earth in its 4.5 billion years of evolution.During the development process of geology and historical geology,many hypothesis and viewpoints were put forward on geological phenomena and biological evolution,which have promoted the development of earth science and enriched human's understandings of nature.As contemporary earth scientists,we need to have a dialectical materialist view of the earth's hist...
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