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Word: volcanism (lookup in dictionary) (lookup stats)
Dates: during 1970-1979
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Usage:

...more dust particles. The particles, in turn, tend to scatter the blue (or shorter) wave lengths of the spectrum more than the red, thereby causing the sky to redden at sunset or sunrise. McCormick and Fuller say that the probable source of the new dust is the frequently erupting Volcan de Fuego in Guatemala...

Author: /time Magazine | Title: Science: Samplings | 1/13/1975 | See Source »

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