Ancient ocean oxygen levels associated with changing atmospheric carbon dioxide
Why do carbon dioxide levels in the atmosphere wax and wane in conjunction with the warm and cold periods of Earth's past? Scientists have been trying to answer this question for many years, and thanks to chemical clues left in sediment cores extracted from deep in the ocean floor, they are starting to put together the pieces of that puzzle.
from Latest Science News -- ScienceDaily https://ift.tt/36hWN6B
from Latest Science News -- ScienceDaily https://ift.tt/36hWN6B
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