An Iridium-Rich Layer of Clay,glass Spherules,and Shocked Quartz Grains Strongly

question 57

Multiple Choice

An iridium-rich layer of clay,glass spherules,and shocked quartz grains strongly suggests that the K-T boundary extinctions were at least in part caused by

• A) a long trend of global warming.
• B) a long trend of global cooling.
• C) worldwide explosive volcanism.
• D) the impact of a bolide (meteoroid or comet).

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