What Was On Earth 3 Billion Years Ago?
What Was On Earth 3 Billion Years Ago? Around 3 billion years ago, Earth may have been covered in water – a proverbial “waterworld” – without any continents separating the oceans. … The most plausible explanation for that is as the continents formed, the land ended up “sequestering” oxygen-18 from the oceans. What is the