Phenomena rooted in the solid earth or the upper atmosphere rather than in a living community or the ocean: the aurora, erosion and wildfire. A residual, honestly named group for natural phenomena that do not fit a biological, oceanic or climate category.
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1. Wikipedia: Geologic time scale
WikipediaGeologic time scale, lead section, span sentenceQuote, Geologic time scale, lead section, span sentence
The geologic time scale...a time span of about 4.54 +/- 0.05 billion years.
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