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Describe two pieces of evidence that support the hypothesis that an asteroid impact was
responsible for the iridium anomaly.
Answer:A dust cloud from an asteroid impact would have killed marine plants requiring uninterrupted sunlight, but many were unaffected. The iridium deposits may have been spewed by volcanoes. ... The Chicxulub structure may be a volcanic sequence of late Cretaceous age, not an impact meltsheet of Cretaceous-Tertiary age.
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