Discussion
The Quaternary records have indicated that the glacial to interglacial transition is ..................... and vice-a-versa is .........................
Answer: A
The glacial to interglacial transition is abrupt, and the reverse is gradual.
Ice-core and marine oxygen isotope records of the last 800,000 years show a sawtooth pattern: ice sheets build up slowly over tens of thousands of years, then collapse quickly in glacial terminations lasting only a few thousand years, as at the end of the last glaciation. So warming out of a glacial is abrupt, and cooling into the next glacial is gradual.
The pairs gradual-abrupt and slow-fast reverse this asymmetry, and 'pulsating, smooth' does not describe it.
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