Heinrich layers in the sedimentary record show us that, during each 10,000- to 15,000- thousand-year cooling cycle over the past 80,000 years,

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Quizplus · Accepted Answer

Heinrich layers in the sedimentary record are evidence of massive discharges of icebergs into the oceans, occurring during each cooling cycle. There is no evidence of mass death of phytoplankton or sudden global cooling happening without a known reason. However, there is evidence of a sudden warming event occurring at the end of each cycle, which may be related to changes in ocean currents or increased solar radiation. But this was not one of the choices given. Therefore, the best choice is B.

Heinrich Layers in the Sedimentary Record Show Us That, During