Which of the following is not true concerning the interglacial period that began 15,000 years ago?

An interglacial period (or alternatively interglacial) is a geological interval of warmer global average temperature lasting thousands of years that separates consecutive glacial periods within an ice age. The current Holocene interglacial began at the end of the Pleistocene, about 11,700 years ago.

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Very useful. it is to learn because history repeats itself so learning about it those mistakes not happen again.