As in the modern ocean, these carbon-rich layers could have accumulated as planktonic bacteria at the surface died and settled to the ocean floor ... F. Earth’s early atmosphere.

When S2 struck the Earth, it would have triggered a massive tsunami that would have churned the ocean floor ... boiled away ...

This image of our planet is the closest we get to a real-time view of how carbon dioxide builds up in our atmosphere. Jan. 1 CO2 emitted by: Fossil fuels Fire Land Ocean Loading data ...