Archean Aeon ◉

: The Archean Earth was primarily a water world, with much of the early continental crust submerged under oceans deeper than those of today.

: Rocks known as TTGs (Tonalite-Trondhjemite-Granodiorite) dominate the Archean record, reflecting unique magmatic processes driven by the Earth's significantly higher internal heat. archean aeon

During this period, the Earth transitioned from a high-heat "stagnant-lid" or "proto-subduction" state into a more modern style of global plate tectonics. : The Archean Earth was primarily a water

: The Earth's crust began to stabilize, forming ancient continental nuclei known as cratons . archean aeon

: The end of the Archean (3.0–2.5 Ga) marked the global initiation of "modern-style" subduction-collision cycles as the planet cooled. Atmosphere and Climate