PRISCOAN
Hadean, Hadean time, Hadean eon, Hadean aeon, Priscoan, Priscoan eon, Priscoan aeon
(noun) the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life
Source: WordNet® 3.1
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29 April 2024
SUBDUCTION
(noun) a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate
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