The onset of the Younger Dryas (about 12,800 years ago) was signaled by a(n)
A) destabilization of the ice sheets and deposition of a massive Heinrich layer.
B) unexplained global warming that took place within a decade.
C) rise in the level of oxygen 18 in North Atlantic planktonic foraminifera.
D) mass extinction of the flower Dryas in the northern hemisphere.
Correct Answer:
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