Heinrich Layers in the Sedimentary Record Show Us That, During

Multiple Choice

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,

A) there was a sudden warming event occurred at the end of the cycle.
B) there were massive discharges of icebergs into the oceans occurred.
C) there was mass death of phytoplankton in the oceans occurred.
D) sudden global cooling can happen without a known reason.