Hadean | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-22

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Hadean


00:00:45 1 Etymology
00:01:15 2 Subdivisions
00:03:00 3 Hadean rocks
00:04:23 4 Atmosphere and oceans
00:07:03 5 See also



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Speaking Rate: 0.8184295505418915
Voice name: en-AU-Wavenet-C


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SUMMARY
=======
The Hadean ( ) is a geologic eon of the Earth pre-dating 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. As of 2016, the ICS describes its status as "informal". Geologist Preston Cloud coined the term in 1972, originally to label the period before the earliest-known rocks on Earth. W. Brian Harland later coined an almost synonymous term, the "Priscoan period", from priscus, the Latin word for "ancient". Other, older texts refer to the eon as the Pre-Archean.