События
Thea hits Earth, causing moon
to formOceans cover the Earth and volcanoes form islands in the oceanLife begins with first bacteriaSupercontinent Rodinia formsRodina splits in twoCrustal plates move to form a new supercontinent: GondwanaПериоды
Layers of Earth form including crust, mantle, and iron core; Magnetic field of Earth formsMeteorites rain down on Earth, bringing water and salt; Water begins to build up on Earth’s surface.Oceans become a ‘chemical
soup’ due to minerals from meteorites and ocean floor chimneysStromatolites (bacterial colonies) begin adding oxygen to water through photosynthesisOxygen levels build up in atmosphere, turning sky blueHeat from inside Earth causes crust to break into plates (First plate tectonics)Volcanoes pump huge amounts of CO2 into the atmosphere causing acid rain and rocks absorb acid rain causing CO2 and temperatures to drop.Earth freezes over (Snowball Earth)Volcanoes pump extra CO2 into the atmosphere causing temperatures to warm and Earth thaws, pumping extra oxygen back into the atmosphere. Life in the oceans begins to make a slow comeback.Ultraviolet radiation from the sun interacts with oxygen in the upper atmosphere to begin forming ozone.Pre-cambrian era
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