Word: soot
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Dates: during 1920-1929
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...soot-laden white mist of great weight. Owing to the warmth of the ground and the consequent lighter pressure the fog descends from its chilly couch in the skies-that is, when there is no wind to blow it away-and covers the earth until the heat gradually dissipates it. Were it not for the soot, the mist would probably be dissipated by the surface heat as it descended...