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Inner Core (Plate tectonics)
solid dude to high pressure
Outer core (plate tectonics)
molten iron
Mantle (plate tectonics)
mostly solid rock of iron and mag-silicate, flows slowly
Crust (plate tectonics)
mostly granite (continents) and basalt (oceans)
Lithosphere (plate tectonics)
crust + upper mantle, broken into ~20 plates that can move over plastic mantle
Stromatolites
earliest microfossils from 3.5Ga
Cyanobacteria
earliest evidence 2.1+Ga (disputed fossils)
Algae-like plants
1 Ga, very new