1. K-T Asteroid Theory of Dinosaur Extinction (1980) Walter Alvarez postulates that high levels of iridium found in rock core samples around the world provide evidence that an asteroid impact caused the... continue reading
posted by eric3579 1 decade 5 years 10 months 3 weeks ago • 6,032 views • 46:56100 Greatest Discoveries Series
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Updated: 1 decade 4 years 11 months ago
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100 Greatest Discoveries Series