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hit the earth 12,000 years ago, resulting in widespread fires, floods, poisonous gases, and unusually vicious and prolonged winters. The catastrophe destroyed a more advanced civilization, forcing its terrified population to seek shelter in caves. As cave-dwellers, they lost all knowledge of art,
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has separated out from the iron, as if they had undergone tremendous heat and pressure, as they likely would in the event that a comet struck the earth. He rules out other theories that could have caused this, such as
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and warm rains, by stating that this is an isolated incident, whereas warm rains can occur at any time and place and there's no archaeological evidence for the nitric acid's origins.
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published first in 1883. It is a companion to the more well-known work
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He cites as evidence 900-foot-deep cracks radiating outward from the
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literature, music, philosophy, and engineering (see
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