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Plate tectonics fired up at least 3 billion years ago, study of ancient rocks in Australia indicates
If the findings are correct, these battered rocks might be the earliest evidence ... suggests tectonic activity may date back ...
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Did plate tectonics give rise to life? Groundbreaking new research could crack Earth's deepest mystery.
Fewer than 7% of rocks on the surface today are older than 2.5 billion years. Go back before 4.03 billion years, to the Hadean eon, and the rock record has completely vanished. The first half ...
PBS8y
Deep Time
The Precambrian eon is vast, almost unimaginably so ... this includes all of geological time prior to the Cambrian period. Hadean Era (4,550-3,850 mya) The Precambrian's oldest era, the Hadean ...
Nature3y
Major events in the evolution of amino acid synthesis
The way amino acids are synthesized has changed during the history of Earth. The Hadean eon represents the time from which Earth first formed. The subsequent Archean eon (approximately 3,500 ...