The amount of oxygen in the Earth's atmosphere makes it a habitable planet.
, and completely lacking multi-cellular life. Another alien aspect of this world was the nature of its tectonic activity.
On modern Earth, the dominant tectonic activity is called plate tectonics, where oceanic crust – the outermost layer of the Earth under the oceans – sinks into the Earth's mantle at points of convergence called subduction zones.
The identification of such magmas in Neoarchean magmatic rocks could provide evidence that subduction and plate tectonics occurred 2.7 billion years ago.We collected samples of 2750- to 2670-million-year-old granitoid rocks from across the Abitibi-Wawa subprovince of the Superior Province – the largest preserved Archean continent stretching over 2,000 kilometers from Winnipeg, Manitoba, to far-eastern Quebec.
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