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Arrange the following periods in order from oldest to most recent.
1. the Medieval Climate Anomaly
2. the last glacial maximum
3. the instrumental record
4. the early Holocene thermal maximum

  • A.4 - 2 - 1 - 3
  • B.2 - 1 - 4 - 3
  • C.2 - 4 - 1 - 3
  • D.3 - 1 - 4 - 2

Answer: C

The sequence spans some twenty thousand years and each interval is known from a different combination of proxies. The instrumental record covers only the last century and a half. Each interval rests on its own proxies.

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