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Science In Action

CHAPTER

The Atmospheric Oxide Concentration

The atmosphere, ye, the atmospheric oxygen concentration, there's something that we term the fire window. If it were to fall below about 16 %, wild fires just wouldn't be able to propagate. So the very fact of your seeing this charcoal gives you a sense onththi 430 million years ago, atmospheric oxygen was pretty much the same as it is to day.

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