Hadean - Alchetron, The Free Social Encyclopedia
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Hadean - Alchetron, The Free Social Encyclopedia
The Hadean ( hedin) is a geologic eon of the Earth predating the Archean. It began with the formation of the Earth about 4.6 billion years ago and ended, as defined by the ICS, 4 billion years ago. The geologist Preston Cloud coined the term in 1972, originally to label the period before the ea
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